Any drug whose production, possession, importation, and distribution is strictly regulated or outlawed. These include depressants (such as barbiturates), hallucinogens (LSD, mescaline, and peyote), marijuana, opiates (heroin, morphine, and opium), and stimulants (amphetamines and cocaine). The substances are listed in five categories, or schedules, according to their characteristics and the type and degree of regulation is determined by the category the particular substance is in.