Identify a non-narcotic depressant from the list below.

The identification of a non-narcotic depressant as alcohol is based on its classification and effects on the central nervous system. Alcohol is a widely recognized depressant that primarily affects neurotransmitter systems, particularly by enhancing the effects of gamma-aminobutyric acid (GABA), leading to a calming and sedative effect. This is significant when considering the context of substance classification and effects.

In contrast, the other substances listed—morphine, oxycodone, and heroin—are all narcotic analgesics, specifically opioids, which not only have depressant effects but are primarily used for pain relief. These substances interact with opioid receptors in the brain and have a potential for addiction and respiratory depression, marking them distinctly as narcotic substances rather than non-narcotic depressants.

Understanding these classifications is essential in the context of law enforcement and investigations in immigration and security training, as it aids in recognizing and addressing issues related to substance misuse and abuse effectively.