Which substance is an example of a Schedule II drug?

The correct answer identifies PCP (phencyclidine) as a Schedule II drug due to its high potential for abuse and the significant risk of dependency. Schedule II substances are classified under the Controlled Substances Act because they demonstrate medical utility but possess a high potential for abuse that can lead to severe psychological or physical dependence. PCP, initially developed as an anesthetic, is now mostly known for its psychoactive effects and is associated with a variety of health risks.

In contrast, mephedrone is classified as a Schedule I drug, meaning it is deemed to have no accepted medical use and presents a significant risk of abuse. Cough syrup with codeine may vary depending on its formulation; however, formulations with a lower concentration of codeine often fall into Schedule V, which contains substances with lower potential for abuse. Diazepam is categorized as a Schedule IV substance, which indicates it has a lower potential for abuse relative to Schedule II drugs but is still subject to strict regulation.

Understanding the scheduling of drugs helps in recognizing their potential for abuse, risks, and medical use, which is crucial for law enforcement and public health considerations.