How does the DOT define "controlled substances"?

The definition of "controlled substances" according to the DOT includes any drug that has a potential for abuse and is regulated under the Controlled Substances Act. This regulation is essential as it categorizes substances based on their potential for dependency and abuse, paving the way for strict oversight and management.

Controlled substances either have legitimate medical uses—like certain opioids or stimulants—or they might be completely illegal. This broad definition encompasses both prescription medications that can be abused and illegal substances. The criterion is based on the risk of abuse and the need for regulatory measures to ensure safety, rather than solely on the legal status of the substance or availability to consumers.

Other choices do not capture the full scope of the definition: over-the-counter drugs do not typically fall under the controlled substances classification, prescription medications alone do not account for the variety of drugs that may be considered controlled, and simply labeling only illegal substances neglects medications that, while legal, can still be abused. Therefore, the comprehensive approach in defining controlled substances highlights their potential for abuse, justifying the regulatory framework established under the law.