Which of the following is an example of a Schedule I substance?

Schedule I substances are classified under the Controlled Substances Act as drugs that have a high potential for abuse, lack accepted medical use in treatment in the United States, and have no accepted safety for use under medical supervision.

Marijuana is considered a Schedule I substance because it has been classified as having a high potential for abuse and currently lacks an accepted medical use according to federal law, despite its legalization for medicinal and recreational use in many states.

In contrast, oxycodone, codeine, and alprazolam are classified as Schedule II and Schedule IV substances due to their accepted medical uses and the existence of documented safety protocols for medical supervision, albeit still carrying risks of abuse and dependency. Understanding these classifications is crucial for those in correctional and probation roles, as it aids in recognizing the legal implications of substance possession and usage.