Which agency regulates the federal insecticide, fungicide, and rodenticide law?

The Environmental Protection Agency (EPA) is responsible for regulating the federal insecticide, fungicide, and rodenticide law, commonly known as FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act). This law provides the framework for the registration, distribution, sale, and use of pesticides in the United States to ensure they do not pose an unreasonable risk to human health or the environment. The EPA is tasked with evaluating pesticides for safety and efficacy before they are approved for use, enforcing regulatory compliance, and monitoring pesticide application practices.

The agency's primary goal is to safeguard public health and the environment by preventing hazardous substances from causing harm. Its role encompasses risk assessments, reviewing labeling for accuracy, and ensuring that manufacturers meet necessary safety standards. This regulatory oversight is pivotal for maintaining safe pesticide practices and ensuring that pest control professionals apply substances responsibly.

In contrast, the other agencies listed have different responsibilities, such as defense, health services, or medical research, which do not directly involve the regulation of pesticides. Hence, the correct answer clearly highlights the EPA's critical role in pesticide oversight.