No pesticide may be bought, sold, or used in the United States until it has what?

The correct answer highlights the regulatory framework that governs pesticide use in the United States. For a pesticide to be legally bought, sold, or used, it must first undergo a thorough review and obtain federal registration from the Environmental Protection Agency (EPA). This registration process ensures that the pesticide is evaluated for safety and effectiveness.

The necessity for a federal registration extends not only to the product itself but also to the label. The label must provide clear instructions for safe and effective use, including necessary precautions to protect human health and the environment. Both the federal registration of the pesticide and its label are crucial for compliance with the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).

Thus, when considering the requirements for legality in purchasing, selling, or using pesticides in the U.S., both the registration for the product itself and the registration that governs how it is to be applied (as outlined on its label) are essential. Therefore, the combination of both the product registration and the label registration exemplifies the comprehensive regulatory standards in place.