Which category includes substances with no accepted medical use and examples such as crack cocaine and heroin?

The category that includes substances with no accepted medical use, such as crack cocaine and heroin, is classified as Schedule I Narcotics. This classification indicates that these drugs are considered to have a high potential for abuse and pose significant risks to public health and safety. Schedule I substances are not recognized for medical use in the United States and cannot be prescribed by healthcare professionals.

Examples like crack cocaine and heroin exemplify the characteristics of Schedule I drugs, as they not only lack medical acceptance but also are associated with severe psychological or physical dependence. This classification is vital for regulating the use and distribution of dangerous drugs, ensuring that there is strict control over substances that can lead to significant abuse and negative health outcomes.

Other schedules, such as Schedule II, III, and IV, do allow for medical use and have varying degrees of control and potential for abuse, distinguishing them from Schedule I substances.