Controlled substances are defined in Section 48-901.02(4) as a drug or substance that falls within Schedule I through V of the Controlled Substances Act (CSA). Schedule I controlled substances are the most strictly regulated because they are deemed the most dangerous and have a high potential for abuse. Conversely, Schedule V controlled substances are the least regulated because of a low potential for abuse and injury. In the District of Columbia, drug offenses are generally broken down into different levels of prohibited acts, which are divided into one of four categories listed alphabetically.