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Controlled substances are defined as medications that have a high potential for abuse and may lead to severe psychological or physical dependence. These substances are regulated by law due to their potential for misuse and addiction. For this reason, they are categorized into schedules, which determine how strictly they are regulated based on their potential for abuse, accepted medical use, and safety level.

Understanding the nature of controlled substances is crucial for medication aides, as they must handle these medications responsibly and adhere to strict protocols regarding their distribution and administration. Options that mention over-the-counter medications, limited quantities, or safe use without supervision do not accurately capture the essence of what makes a substance "controlled." Controlled substances specifically refer to those that require careful monitoring and regulation due to their risks.