Monsanto v. Durnell · ¶103

“A requirement is a rule of law that must be obeyed.” Bates, 544 U. S., at 445. In interpretating FIFRA, this Court has previously held that the term “requirements” includes “positive enactments, such as statutes and regulations,” as well as “common-law duties.” Id., at 443. Thus, the “requirements” under FIFRA that can preempt state labeling requirements are those directives “set out in FIFRA and its implementing regulations.” Id., at 452.

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