Which description best fits Schedule I controlled substances?

Which description best fits Schedule I controlled substances?

• A. Substances with high potential for abuse but with an accepted medical use
• B. Substances with low potential for abuse and recognized medical uses
• C. Substances with an unacceptable safety, high potential for abuse/addiction, and no accepted medical use
• D. Substances with medical use and restrictions

Answer: (C)

Schedule I is defined by three criteria: the highest potential for abuse, no currently accepted medical use in the United States, and a lack of accepted safety for use under medical supervision. The description that states substances have unacceptable safety, high potential for abuse/addiction, and no accepted medical use matches all of these criteria exactly, so it is the best fit. This category is the most restricted: substances are not prescribed or dispensed and are allowed in the supply chain only under strict regulatory controls for research. The other descriptions align with other schedules—for example, high abuse potential with medical use points to Schedule II, and low potential with medical uses fits Schedule IV or V—so they don’t describe Schedule I.

Schedule I is defined by three criteria: the highest potential for abuse, no currently accepted medical use in the United States, and a lack of accepted safety for use under medical supervision. The description that states substances have unacceptable safety, high potential for abuse/addiction, and no accepted medical use matches all of these criteria exactly, so it is the best fit. This category is the most restricted: substances are not prescribed or dispensed and are allowed in the supply chain only under strict regulatory controls for research. The other descriptions align with other schedules—for example, high abuse potential with medical use points to Schedule II, and low potential with medical uses fits Schedule IV or V—so they don’t describe Schedule I.