Which substance classification cannot be legally dispensed without proper authority?

The classification of substances that cannot be legally dispensed without proper authority encompasses Class I, II, III, IV, or V controlled substances. These substances are tightly regulated due to their potential for abuse and addiction, alongside varying degrees of medical utility.

Controlled substances are categorized into schedules based on their potential for abuse, safety, and medical applications. For example, Class I substances are considered to have no accepted medical use and a high potential for abuse, making them illegal to dispense without specific federal and state authorization. Class II to V substances, while having accepted medical uses, also require careful scrutiny and strict compliance with legal regulations for prescribing and dispensing.

This classification is essential for ensuring public safety and medical integrity. It promotes responsible use and minimizes the risk of substance misuse. Therefore, anyone wishing to dispense these substances must hold appropriate licenses and follow prescribed regulatory guidelines, signifying why the answer is correct.