What defines a "controlled substance"?

A "controlled substance" is defined as a drug that is regulated by law. This classification means that the substance is subject to legal restrictions regarding its manufacturing, distribution, possession, and use. Controlled substances are categorized into schedules based on their potential for abuse, accepted medical use, and safety or dependence liability. This legal framework is important for ensuring that substances that may be harmful or have a high potential for abuse are used properly and monitored by healthcare professionals.

The other definitions, although possibly relevant in different contexts, do not accurately capture the essence of what makes a substance "controlled." For example, while some controlled substances may have no medical use or may be toxic, there are also many that are legitimately prescribed for medical purposes but still require regulation. Similarly, over-the-counter drugs, while available without a prescription, typically do not fall under the category of controlled substances because they are not considered to have a high potential for abuse. Lastly, non-toxic herbal remedies are not classified as controlled substances since they usually do not pose the same legal or health risks associated with regulated drugs.