Which schedule system does 21 USC § 812 use to classify controlled substances?

The classification of controlled substances as per 21 USC § 812 is based on a system of schedules that differentiates substances according to their potential for abuse, accepted medical use, and safety or dependence liability. This system consists of five schedules, with Schedule I indicating substances that have a high potential for abuse and no accepted medical use, while Schedule V includes substances that have a low potential for abuse and accepted medical use.

The correct answer reflects this five-tier system, which serves to regulate the availability and use of various drugs in a way that balances medical needs with concerns about potential abuse and public health. Each schedule is carefully defined to accommodate the varying levels of risk associated with different substances.