Final answer:
The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) requires federal registration of pesticides shipped in interstate commerce.
Step-by-step explanation:
The law that requires federal registration of pesticides shipped in interstate commerce is the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). This act is administered by the Environmental Protection Agency (EPA) and ensures that all pesticides legally sold in the United States are registered and regulated by the federal government.