What is legally defined as a "restricted use pesticide"?

A "restricted use pesticide" is characterized by its potential risks to human health or the environment, which necessitates that only certified applicators can handle and apply it. This certification ensures that individuals have undergone the necessary training and education to understand the proper handling, application, and safety procedures associated with these pesticides. By limiting the application of these substances to trained professionals, regulations help mitigate the risks associated with their misuse.

The other options do not accurately capture the definition of a restricted use pesticide: pesticides that can be applied by anyone or those that require no certification do not fall under this classification, as they are considered less hazardous. Additionally, a pesticide that is banned in all states would not be classified as "restricted" but rather completely prohibited. Thus, the requirement for certified applicators reflects the need for responsible management of potentially dangerous chemicals.