Bergeson & Campbell, P.C. serves small, medium, and large pesticide product registrants and other stakeholders in the agricultural and biocidal sectors, in virtually every aspect of pesticide law, policy, science, and regulation.

By Lisa M. Campbell, Lisa R. Burchi, and James V. Aidala

On February 26, 2018, the U.S. District Court for the Eastern District Court of California issued a memorandum and order on the plaintiff’s motion for preliminary injunction (Order) to “enjoin the listing of glyphosate under Proposition 65 (Prop 65) and the application of its attendant warning requirement pending a final judgment in this case and set a schedule for expedited final resolution of the case.”  The Order (1) grants plaintiffs’ request for a preliminary injunction enjoining the warning requirement of California Health & Safety Code § 25249.6 as to glyphosate; and (2) denies the request for a preliminary injunction enjoining defendants from listing glyphosate as a chemical known to the State of California to cause cancer under California Health & Safety Code § 25249.8.  Specifically, the Order states: “pending final resolution of this action, defendants … are hereby ENJOINED from enforcing as against plaintiffs … California Health & Safety Code § 25249.6’s requirement that any person in the course of doing business provide a clear and reasonable warning before exposing any individual to glyphosate.”  Although this is only a preliminary injunction while the case continues further resolution, it is extremely significant that, for now, glyphosate will continue to be listed on California’s Prop 65 list as a “chemical known to the State of California to cause cancer,” but products containing glyphosate will not be required to comply with the warning requirement.

Plaintiffs’ memorandum supporting its motion for preliminary injunction states that Prop 65’s requirement for products containing glyphosate to include a warning that glyphosate is “known to the State of California to cause cancer” is unconstitutional under the First Amendment, and, if allowed to go into effect, will cause Plaintiffs’ “reputational, competitive, and economic harms for which they cannot be compensated.”  Plaintiffs state that the “legal merit of their First Amendment claim is indisputable and obvious on the face of the attached documents without any need for discovery, and thus the claim is appropriate for expedited judicial resolution.”  California’s Office of Environmental Health Hazard Assessment (OEHHA), the agency responsible for implementing Prop 65, listed glyphosate as a chemical known to the state of California to cause cancer on July 7, 2017, and the attendant warning requirement would have taken effect on July 7, 2018.

In support of denying the request for a preliminary injunction enjoining defendants from listing glyphosate under Prop 65, the court states that plaintiffs “have not shown a likelihood of success on the merits of their claim that the listing of glyphosate violates the First Amendment, because the listing is government speech, not private speech … [and it] is only the upcoming July 2018 deadline for providing the [Prop 65] warning that compels private speech.”  The court noted further that Plaintiffs “have not shown a likelihood of irreparable harm should the court fail to enjoin the listing of glyphosate, because any harm that plaintiffs might suffer is caused by the warning requirements of [Prop 65], rather than the listing itself.”  Accordingly, the court denied a preliminary injunction based on plaintiffs’ claim that the glyphosate listing violates the First Amendment.

On the other hand, in support of granting the request for a preliminary injunction enjoining the application of the attendant warning requirement, the court stated:

  • On the evidence before the court, the required warning for glyphosate does not appear to be factually accurate and uncontroversial because it conveys the message that glyphosate’s carcinogenicity is an undisputed fact, when almost all other regulators have concluded that there is insufficient evidence that glyphosate causes cancer.

The court also stated that the required warnings are “false and misleading” and that plaintiffs “have shown that they are likely to succeed on the merits of their First Amendment claim, are likely to suffer irreparable harm absent an injunction, and that the balance of equities and public interest favor an injunction, the court will grant plaintiffs’ request to enjoin [Prop 65]’s warning requirement for glyphosate.”

This case, while not the end of the story, is a very significant development both for glyphosate specifically and perhaps for Prop 65 warning requirements generally.  Industry should follow this case closely given the implications for glyphosate and potentially other Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA)-regulated pesticides and chemicals generally.  Some in industry have long been concerned that Prop 65 warning requirements contradict conclusions supported by the data and reached by other agencies such as the U.S. Environmental Protection Agency (EPA).  This decision is a huge preliminary win for those with these concerns and, depending on the ultimate outcome of the case, could provide a precedent for additional challenges related to other substances.  The potential reach of the case beyond glyphosate, however, will likely be dictated heavily by the facts of each case. 


By Lisa M. Campbell, James V. Aidala, and Lisa R. Burchi

Beginning on January 23, 2018, the European Commission (EC) opened a consultation period on the European Food Safety Authority (EFSA) risk assessment process (scientific advice).  The EC states it is seeking feedback on its process both as  a “follow-up to the commitments made by the Commission in reply to the European Citizens’ Initiative on glyphosate,” and in response to “citizens [that] have put into question the risk assessment based on studies provided by the industry and this in particular where the industry seeks an authorisation, e.g. for  pesticides, GMOs etc.”

The General Food Law Regulation established EFSA, an independent scientific agency, to provide the risk assessment component of its risk analysis principle; the other two components are risk management and risk communication.  EFSA provides its scientific opinions “which form the basis for the measures taken by the [European Union (EU)] in the food chain.”  The EC states the General Food Law Regulation “is the cornerstone of the EU regulatory framework covering the entire food chain:  ‘from farm to fork.’”  The EC is requesting feedback to help it “look into how [the EC] can improve the current system and to address citizens’ expectations about independence and transparency of the EU risk assessment system.”   The EC is specifically requesting views and experiences on the following:

  • The transparency and independence of the EU risk assessment system with respect to the underlying industry studies and information on which EFSA's risk assessment/scientific advice is based;
  • Risk communication; and
  • The governance of EFSA, in particular the involvement of the EU Member States (MS) in the EU risk assessment system.

To contribute, interested parties must fill out the online questionnaire available here.  All stakeholders and EU as well as non-EU citizens are welcome to contribute to this consultation.  The consultation period will close on March 20, 2018


This Consultation is of significant interest to stakeholders, particularly in balancing the potential need for increased transparency with the need to protect confidential business information, trade secret information, and proprietary expensive data investments.  Decisions made by EFSA also could have a global impact on data protection, as any decisions made by EFSA to increase transparency could affect whether certain data can continue to be protected under other regulatory programs. 

Outside of the transparency issues that are receiving much attention of late, it is important to note generally that views about risk assessment policies across governments tend to be driven by underlying political disagreements, with support or criticism somewhat predictable depending on how the resultant decisions are “for or against” the view of an interested constituency. 

The transparency issue here should be considered not only on its own merits, but also within the controversy that surrounded the EU assessment approach for glyphosate, an herbicide which is widely used in production of genetically modified crops.  As a stalking horse for the EU debate about biotechnology crops, the EU glyphosate assessment has, for example, become embroiled as part of the glyphosate carcinogenic classification of the International Agency for Research on Cancer (IARC).  See our blog item IARC Announces Cancer Classification for Glyphosate and Other Pesticides.  The IARC review concluded that glyphosate is a “probable human carcinogen,” contrary to most other assessments done by the U.S., Canada, and some EU Member States.  Comments on the general EU risk assessment process can be expected to be intertwined with the perspective that any commenter has on the glyphosate assessment, even though the request is for public comment on the assessment process generally, and not only specifically about glyphosate. 

More information on glyphosate is available on our blog under key word glyphosate.


By Lisa R. Burchi and Lisa M. Campbell

On January 2, 2018, State Attorneys General from eleven states (Idaho, Indiana, Iowa, Kansas, Louisiana, Michigan, Missouri, North Dakota, Oklahoma, South Dakota, and Wisconsin) (collectively the States) filed a friend of the court brief in Nat’l Ass’n of Wheat Growers v. Zeise, E.D. Cal. (No. 2:17-cv-02401) (Brief), a case challenging California Office of Environmental Health Hazard Assessment’s (OEHHA) decision to list glyphosate as a carcinogen under Proposition 65 (Prop 65).

OEHHA listed glyphosate under Prop 65 on March 28, 2017, but the effective date of the listing was delayed until July 7, 2017, following a decision from the Fifth District Court of Appeals that denied Monsanto’s request for a stay of such listing.  OEHHA stated that its listing was required under its Labor Code listing mechanism, which OEHHA states requires it to list under Prop 65 certain substances identified by the International Agency for Research on Cancer (IARC) as known to cause cancer.  Information about Monsanto’s earlier challenge is available in our blog item California Court Tentatively Dismisses Monstano’s Lawsuit Against OEHHA to Block Addition of Glyphosate to Proposition 65 List.


On November 15, 2017, a nationwide coalition of agricultural producers and business entities (including Monsanto) filed a Complaint against OEHHA on the grounds that its listing of glyphosate as a carcinogen and the Prop 65 warning requirement triggered by that listing:  (1) violate the First Amendment of the U.S. Constitution by compelling Plaintiffs and other entities to make false, misleading, and highly controversial statements about their products; and (2) violate the Due Process Clause of the Fourteenth Amendment of the U.S. Constitution because OEHHA’s actions are not rationally related to any legitimate state interest; and (3) violate the Supremacy Clause of the U.S. Constitution by conflicting with, and being preempted by, the Federal Food, Drug, and Cosmetic Act (FFDCA).  Plaintiffs filed an amended Complaint on December 5, 2017.

On December 6, 2017, Plaintiffs also filed a motion for preliminary injunction (Motion), arguing that they are likely to succeed on the merits of their claim that the Prop 65 listing violates the First Amendment.  The Motion argues that the warning will fail under any level of constitutional scrutiny, whether it is considered under “laws regulating commercial speech that generally receive at least intermediate scrutiny, i.e., they are prohibited if they do not directly and materially advance the government’s interest, or are more extensive than necessary,” or laws that require disclosure of information in connection with commercial transactions, which “are permissible only if the compelled disclosure is of information that is purely factual, uncontroversially accurate, reasonably related to a substantial government purpose, and not unduly burdensome or chilling.  See Zauderer v. Office of Disciplinary Counsel, 471 U.S. 626, 651 (1985).”  Motion at 23-36; Complaint at 26-28.

In agreeing with Plaintiffs that OEHHA’s Prop 65 listing of glyphosate forces businesses to issue “false and misleading” statements about their products and asking the court to grant the Plaintiffs’ motion for a temporary restraining order and preliminary injunction, the Attorneys General state in their Brief:

  • The First Amendment injuries identified by Plaintiffs are heightened because they adversely impact the sovereign interests of other States in at least two ways. First, by requiring false or misleading statements about glyphosate products, California’s speech mandate imposes confusing and potentially inconsistent obligations on nonresident businesses that are bound by other States’ consumer-protection laws not to make false and misleading statements about their own products. Second, the speech mandate impairs consumer-protection efforts of the States that require sensible health-and-safety disclosures by contributing to the well-known phenomenon of disclosure fatigue.

Brief at 4-5 (emphasis in original).

The States also argue that while there may be a presumption to California’s favor that its enforcement of its duly enacted laws reflects the public interest, the Court also “should weigh heavily the fact that California’s mandate interferes with federalism and the sovereign interests of other States when assessing the public interest factor.”  Brief at 10.


This case raises significant constitutional and preemption arguments in a factual context that many in industry believe compelling.  It will be closely monitored.

OEHHA answered Plaintiff’s First Amended Complaint on January 9, 2018.  It is expected to file its opposition to Plaintiff’s Motion for a Preliminary Injunction by January 22, 2018, and file its response to the two amicus curiae briefs filed on behalf of Plaintiffs by January 26, 2018.  Following deadlines for Plaintiffs to file any reply in support of their motion for a preliminary injunction and any responses to amicus curiae briefs in support of Defendants, a hearing on Plaintiff’s motion will be held on February 20, 2018.


By Timothy D. Backstrom, James V. Aidala, and Lisa M. Campbell

On December 18, 2017, the U.S. Environmental Protection Agency (EPA) announced it is releasing for public comment the draft human health and ecological risk assessments for glyphosate.  EPA’s Draft Human Health and Ecological Risk Assessments for Glyphosate website states that the “draft risk assessments and supporting documents will be available in glyphosate’s registration review docket EPA-HQ-OPP-2009-0361 on in early 2018,” and that EPA will “open a 60-day public comment period for the draft risk assessments, evaluate the comments received, and consider any potential risk management options for this herbicide.”  Many of the assessment documents, including the draft human health risk assessment, are already available on EPA’s website, but not yet posted in the docket.

The EPA announcement includes the following summary of EPA’s determinations:

  • The draft human health risk assessment concludes that glyphosate is not likely to be carcinogenic to humans.  The Agency’s assessment found no other meaningful risks to human health when the product is used according to the pesticide label.  The Agency’s scientific findings are consistent with the conclusions of science reviews by a number of other countries as well as the 2017 National Institute of Health Agricultural Health Survey.
  • EPA’s human health review evaluated dietary, residential/non-occupational, aggregate, and occupational exposures. Additionally, the Agency performed an in-depth review of the glyphosate cancer database, including data from epidemiological, animal carcinogenicity, and genotoxicity studies.
  • The ecological risk assessment indicates that there is potential for effects on birds, mammals, and terrestrial and aquatic plants.  EPA used the most current risk assessment methods, including an evaluation of the potential effects of glyphosate exposure on animals and plants. 

EPA states the proposed interim registration review decision for glyphosate is scheduled to be published in 2019.


This latest EPA announcement is consistent with other determinations concerning glyphosate made by EPA in recent years, including statements made during the Obama Administration.  EPA presented its analysis of the carcinogenic potential of glyphosate to the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Scientific Advisory Panel (SAP) in December 2016.  EPA has consistently taken the position that the human health risks from glyphosate are low, and that food and water residues of glyphosate easily satisfy the requirement that they be “safe” for human consumption. 

Critics of glyphosate use often focus on the widespread adoption of glyphosate-resistant bioengineered crops. If these genetically modified organism (GMO) crops were not specifically designed for use in conjunction with glyphosate, there would likely be much less discussion about the safety of the herbicide.

Because EPA’s announcement includes a statement that “there is potential for effects on birds, mammals, and terrestrial and aquatic plants,” critics of glyphosate and the associated GMO crops will likely continue to press for restrictions based on the ecological effects of glyphosate.  Moreover, there is also likely to be continued controversy concerning the human health effects of glyphosate.  Notwithstanding the human health safety findings in this EPA assessment and the other assessments cited in EPA’s statement, the International Agency for Research on Cancer (IARC) has classified glyphosate as “probably” carcinogenic to humans.  It is thus probable that the controversy concerning glyphosate and the associated GMO crops will continue unabated.

More information on glyphosate issues is available on our blog under key word glyphosate.


By Lynn L. Bergeson, Lisa R. Burchi, and Margaret R. Graham

A tentative ruling issued January 26, 2017, in Monsanto Company v. Office of Environmental Health Hazard Assessment, et al., Case No. 16 CE CG 00183, by the Superior Court of California, County of Fresno, granted the Office of Environmental Health Hazard Assessment’s (OEHHA or Defendant) motion for judgment on the pleadings as to Monsanto Company’s (Monsanto) petition and complaint, and sustained the demurrers to Monsanto’s petition and complaint (Sierra Club) and California Citrus’ complaint in intervention, for failure to state facts sufficient to constitute a cause of action.  The tentative ruling was issued prior to the hearing date of January 27, 2017.  If this ruling is made final, Monsanto’s case will be dismissed, but Monsanto has stated it will challenge the tentative ruling. 

Monsanto’s complaint alleged various violations committed by OEHHA under the U.S. and California Constitutions in listing glyphosate on the Proposition 65 (Prop 65) list of chemicals that are known to the state to cause cancer.  Monsanto argues, for example, that OEHHA engaged in an unconstitutional delegation of its rulemaking authority to the World Health Organization’s (WHO) International Agency for Research on Cancer (IARC) when it used the IARC’s classification of glyphosate as “probably carcinogenic to humans” as the basis for the Prop 65 listing.  Specifically, Monsanto argued that the Labor Code listing mechanism upon which the glyphosate listing is based is unconstitutional because OEHHA “cedes the basis of its regulatory authority to an unelected and non-transparent foreign body that is not under the oversight or control of any federal or state government entity.”  The five constitutional violations that Monsanto claimed are:  (1) a violation of the due process clauses of the California and U.S. Constitutions; (2) a violation of free speech under the California and the U.S. Constitutions; (3) a violation of the Guarantee Clause of the U.S. Constitution; (4) a violation of the California Constitution regarding the naming/identifying of IARC (Article II, Section 12); and (5) a violation of the California Constitution through empowering IARC to make laws applicable to California (Article IV, Section 1).

The tentative ruling details the court’s arguments concerning Monsanto’s failure to state facts/insufficiently allege its claims for each of the claims.  Concerning the first allegation on the unconstitutional delegation of authority, the court stated “there is no support for Monsanto’s conclusion that the OEHHA has unconstitutionally delegated its rulemaking authority to the IARC,” since, in part, “the voters and the legislature have established the basic legislative scheme and made the fundamental policy decision with regard to listing possible carcinogens under Proposition 65, and then allowed the IARC to make the highly technical fact-finding decisions with regard to which specific chemicals would be added to the list.”  The court also found no support for any of Monsanto’s other claims.  As of February 1, 2017, the ruling was not yet made final. 


By Lisa M. CampbellLisa R. Burchi and Timothy D. Backstrom

On November 24, 2015, in the U.S. Court of Appeals for the Ninth Circuit, Case No. 14-73353, the U.S. Environmental Protection Agency (Respondent; EPA) filed a motion for voluntary vacatur and remand of EPA’s registration, as amended, of Dow AgroSciences LLC’s (Dow) Enlist Duo herbicide under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).  The motion for vacatur is unusual and noteworthy to all pesticide registrants.

This case commenced in October 2014 when the Natural Resources Defense Council (NRDC) and other environmental groups including the Center for Food Safety (CFS, et al.) (together, Petitioners) filed petitions for review challenging EPA’s decision to register Enlist Duo, a new product designed for use with crops genetically modified to be resistant to glyphosate and 2,4,-D.  Petitioners argued, in part, that EPA failed to consider the impacts of increased glyphosate use on monarch butterflies, and did not fully assess the potential human health effects from 2,4-D.

EPA’s motion reverses EPA previous position that Dow’s application for Enlist Duo satisfied the requirements for issuance of an unconditional registration under FIFRA Section 3(c)(5).  EPA states that it is seeking a voluntary remand to reconsider the Enlist Duo registration in light of new information regarding potential synergistic effects referred to as “synergistic herbicidal weed control” between the two active ingredients 2,4-D and glyphosate contained in Enlist Duo on non-target plants.  Specifically, EPA is in the process of evaluating information submitted to it by DAS on November 9, 2015, in response to EPA’s request for all available information related to synergistic effects. EPA asserts that none of this information was submitted to EPA prior to EPA’s issuance of the Enlist Duo registration.

EPA states that the claimed synergism could affect EPA’s “assessment of drift reduction measures for avoiding impacts to non-target organisms, including those listed as endangered.”  EPA also states that it “cannot be sure, without a full analysis of the new information, that the current registration does not cause unreasonable effects to the environment, which is a requirement of the registration standard under FIFRA” and that its initial review “indicates that the 30-foot buffer included in the registration may not be adequate.”

DAS has until December 7, 2015, to file its response before the court will consider EPA’s motion to remand the registration.  Although it has not completed its assessment, EPA states that if the court vacates the Enlist Duo registration, EPA will issue a cancellation order to regulate the sale, distribution, and use of existing stocks of Enlist Duo pursuant to FIFRA.  This case is being considered for the March 2016 oral argument calendar but the exact date of oral argument has not been determined at this time.  More information regarding this case is available in our blog items Environmental Groups File Opening Briefs Challenging EPA’s Decision to Register Enlist Duo and Ninth Circuit Denies Requests to Stay Use of Enlist Duo Herbicide During Judicial Review.


EPA’s request for remand with vacatur rather than a remand without vacatur is a severe action.  EPA could have chosen to seek remand without requesting that the registration be vacated, and then demanded prompt revision of the buffer zone that EPA now believes may be inadequate to protect non-target plants from synergistic effects.  EPA may have decided to send a message that there will be serious consequences when an applicant fails to submit all of the data in its possession that may be pertinent to EPA’s assessment of the statutory criteria for registration.  In any case, Dow reportedly has stated that it does “not expect these issues to result in the long-term cancellation of the Enlist Duo product registration” and that Dow will “continue to prepare for commercial sales of Enlist Duo for the 2016 growing season with enthusiastic grower adoption."


By Lisa M. Campbell, Lisa R. Burchi, Timothy D. Backstrom, and James V. Aidala

On October 23, 2015, in the U.S. Court of Appeals for the Ninth Circuit, the Natural Resources Defense Council (NRDC) and other environmental groups including the Center for Food Safety (CFS, et al.) (together, Petitioners) filed separate opening briefs in Case Nos. 14-73353 and 14-73359 (consolidated) arguing that the U.S. Environmental Protection Agency’s (EPA) decision to register Dow AgroScience’s Enlist Duo herbicide (a combination of glyphosate and 2,4,-D) for use on Enlist corn and soybeans should be overturned because it violates the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and the Endangered Species Act (ESA).   EPA approved Enlist Duo for use in six states on October 15, 2014, and granted an amendment on March 31, 2015, to authorize use in an additional nine states.  On August 11, 2015, the Court of Appeals denied motions for a stay pending review that were filed by these same environmental Petitioners on December 18, 2014, and February 6, 2015.   SeeNinth Circuit Denies Requests to Stay Use of Enlist Duo Herbicide During Judicial Review.”

In its brief, NRDC notes that when EPA proposed to register Enlist Duo, it stated that no new assessment is needed for glyphosate because use of glyphosate on herbicide-resistant crops is not a new use.  NRDC argues that there are many new studies concerning glyphosate’s human health effects and impacts on monarch butterflies since EPA reregistered glyphosate and last prepared comprehensive environmental and human health assessments in 1993. NRDC argues that “By failing to consider up-to-date science on glyphosate’s cancer risk, EPA again violated its statutory duty to ensure that registration of Enlist Duo would not cause ‘unreasonable adverse effects on the environment,’ which includes an unreasonable risk to human health.”

In their brief, CFS, et al. argue that EPA violated FIFRA by ignoring its own modelling indicating that risks to wildlife from Enlist Duo exceed EPA’s risk thresholds.  CFS, et al. also focus on purported violations of the ESA, arguing that EPA improperly failed to consult with the U.S. Fish and Wildlife Service on the potential impacts of Enlist Duo on protected species and their critical habitat, and that EPA applied an “unlawful approach” to determine whether registration of Enlist Duo “may affect” listed species or critical habitats.

NRDC also filed a motion to supplement the record with three documents that it states were submitted to EPA, but it contends were not considered by EPA before it issued its registration decision for Enlist Duo.  The documents include an article published by the World Health Organization’s (WHO) International Agency for Research on Cancer stating that glyphosate is “probably carcinogenic to humans”; a statement published by WHO in conjunction with its cancer finding, and a letter from NRDC and other concerned parties calling on EPA to reconsider its initial decision to register Enlist Duo in light of the WHO’s cancer finding.


Petitioners’ arguments in these opening briefs are not unexpected, as pesticide products containing glyphosate have been challenged and controversial for many years.  In briefs opposing the prior stay motions by the Petitioners, EPA and the registrant Dow AgroSciences argued that registration of Enlist Duo will not lead to any increase in the use of glyphosate, and that EPA also considered all of the human health effects of 2,4-D before granting the registration.  The Petitioners acknowledge that EPA did not state when it last conducted environmental and human health assessments for glyphosate, and EPA is likely to object to Petitioners' inference that EPA has not reviewed the environmental and health effects of glyphosate since 1993.  In the fact sheet concerning its decision to register Enlist Duo, EPA states that it conducted a “rigorous analysis” of all the scientific studies, considered all public comments, and used worst-case estimates when assessing the safety of Enlist Duo.  In addition, the Petitioners do not discuss the determination by the the U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS), that three varieties of herbicide resistant corn and soybeans on which Enlist Duo will be applied are no longer considered regulated articles under regulations governing the introduction of certain genetically engineered organisms, because they are unlikely to pose a plant pest risk.

EPA and Dow AgroSciences’ answering briefs are due December 18, 2015, and reply briefs are due January 15, 2016.  Oral argument has not yet been scheduled.




By Lynn L. Bergeson, James V. Aidala, and Lisa R. Burchi

On March 20, 2015, the United Nations World Health Organization’s International Agency for Research on Cancer (IARC) announced it had completed evaluations assessing the carcinogenicity of five organophosphate pesticides. Specifically, IARC classified the herbicide glyphosate and the insecticides malathion and diazinon as probably carcinogenic to humans (Group 2A), and classified the insecticides tetrachlorvinphos and parathion as possibly carcinogenic to humans (Group 2B). IARC also found there is “limited evidence” that glyphosate can cause non-Hodgkin’s lymphoma and lung cancer in humans.

A summary of the final evaluations, together with a brief rationale, is published online in The Lancet Oncology; the detailed assessments will be published as Volume 112 of the IARC Monographs. IARC’s press release announcing its evaluation is available at

Monsanto, on behalf of glyphosate task forces in the U.S. and the European Union (EU), immediately voiced its vigorous disagreement with IARC’s conclusions, noting various scientific issues with IARC’s evaluation that resulted in a conclusion that has not been reached following review by the U.S. Environmental Protection Agency (EPA) and in the EU. Monsanto’s statement is available at

The IARC announcement with regard to glyphosate will further energize both sides of the debate about genetically modified organism (GMO) crops, since there are several crops that have been genetically engineered to be resistant to glyphosate. If some occupational risks are identified as needing possible further mitigation, the distinction between food safety issues and occupational risks may be lost in the rhetoric. Opponents of GMO crops and those who support GMO food product labels can be expected to cite the IARC designation regardless of any further clarification or nuance that the scientific debate over the data might provide. Defenders of the technology will insist that not only is the IARC designation wrong and misleading, but it is clearly at odds with numerous other conclusions reached by multiple competent governmental authorities concerning the safety of using glyphosate and especially consuming GMO crops.

Regardless of Monsanto’s rapid and detailed response, “dueling science” views are not helpful towards enhancing public confidence in the safety of the food supply, which is ultimately where this headline will be most influential. That will only add pressure on the review process and conclusions contained in the expected EPA registration review of glyphosate data scheduled for completion in 2015.


By Lisa M. Campbell, Timothy D. Backstrom, and James V. Aidala

Center for Food Safety v. EPA is a case in the U.S. Court of Appeals for the 9th Circuit (9th Circuit) that consolidates two petitions for review of a decision by the U.S. Environmental Protection Agency (EPA) to register the new herbicide product Enlist Duo for use in six Midwestern states. A group of non-governmental organizations filed one of the petitions and the Natural Resources Defense Council (NRDC) filed a separate petition. Enlist Duo combines the active ingredients glyphosate and 2,4-D. The registrant Dow AgroSciences (Dow) has intervened in the case. The petitioners focus primarily on the purported failure of EPA to consider properly the effects of Enlist Duo on certain endangered species.

Each petitioner has now filed a motion to stay the EPA action registering Enlist Duo due to Endangered Species Act (ESA) challenges. The first stay motion filed by NRDC is based primarily on the risk to monarch butterflies, and that stay motion has now been fully briefed. The other petitioners filed a separate stay motion focusing on whooping cranes and Indiana bats, but they waited until two weeks after EPA and Dow filed their briefs opposing the first stay motion. Before either stay motion was filed, Dow filed a motion seeking transfer of the case to the D.C. Circuit Court of Appeals. Arguing that the two independent successive stay motions were abusive, Dow later filed a motion to hold the briefing on the second stay motion in abeyance, pending a ruling on its transfer motion.

The 9th Circuit denied Dow’s motion to hold the briefing on the second stay motion in abeyance only three days later. This procedural ruling does not dispose of the underlying transfer motion, but it does suggest that the court is not inclined to transfer the case. If the case is not transferred, the court will ultimately consider and rule on both pending stay motions. The court’s interim order does not suggest how it views the pending stay motions. The petitioners have a heavy burden to show both a substantial likelihood of success on the merits and irreparable harm to obtain the requested interim relief. EPA and Dow contend that the petitioners have not established either of these things. Overall, this ESA challenge to a new genetically modified organism (GMO) product may indicate a new front in the ESA litigation arena, since new products have generally not been challenged under ESA requirements. 2,4,-D itself is not a new herbicide, so this case is not quite a challenge to a totally new active ingredient; such a challenge was made recently in the case of cyantraniliprole. CBD, et al. v. EPA, No. 14-00942 (D.D.C. filed Oct. 10, 2014). Challenges to new active ingredients and GMO products, however, could threaten to hinder the introduction of new products into the marketplace.