Which statement about federal pesticide regulation is true?

The statement that approved pesticide labels have the force of law is accurate and reflects a key aspect of federal pesticide regulation. Under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), once a pesticide product is registered, the label that accompanies it provides legally binding instructions for its use. This means that anyone using the pesticide must follow the instructions and restrictions outlined on the label, as failure to do so could result in legal penalties. The label specifies the allowable application rates, target pests, and safety precautions, among other critical information, ensuring that the product is used safely and effectively according to regulatory standards.

In contrast, other options convey incorrect interpretations of regulations. Federal regulations do not permit unlimited use of pesticides while they await review. Instead, pesticides must meet certain criteria before approval. Using a pesticide in a manner not explicitly stated on the label is also prohibited; this would violate the terms of its registration. Lastly, while states do have significant authority in pesticide regulation, not all regulations are solely enacted by state agencies—federal regulations play a substantial role in establishing guidelines that states must follow.