The primary focus of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), enacted in 1972, was to provide federal control of pesticide distribution, sale, and use. EPA was given authority under FIFRA not only to study the consequences of pesticide usage but also to require users (farmers, utility companies, and others) to register when purchasing pesticides. Through later amendments to the law, users were required to take exams for certification as applicators of pesticides. All pesticides used in the United States must be registered (licensed) by EPA. Registration assures that pesticides will be properly labeled and that if when used in accordance with specifications will not cause unreasonable harm to the environment.