Controlled Substances — Unlawful Importation is the act of bringing illegal drugs, pharmaceuticals, or other controlled substances into a country in violation of applicable laws. Controlled Substances — Unlawful Importation is a federal crime and can result in severe penalties, including imprisonment. Types of Controlled Substances — Unlawful Importation include importing drugs and controlled substances without a valid prescription, importing drugs from another country without authorization, and attempting to smuggle drugs into a country. The substances typically imported illegally include cocaine, heroin, methamphetamine, marijuana, ecstasy, LSD, and other substances classified as Schedule I, Schedule II, or Schedule III controlled substances.