What constitutes the possession of a controlled substance?

The possession of a controlled substance is defined as having a substance within one's physical control or custody. This means that an individual either has the substance on their person or is able to exercise control over it, such as having it in a bag, car, or another location they safeguard. The legal framework surrounding controlled substances emphasizes the importance of possession because it establishes the direct responsibility and potential criminal liability for individuals who have such substances, regardless of whether they intend to use or distribute them.

Possessing a substance in the manner described highlights that responsibility does not depend solely on whether the substance is actively being used or visible at that moment; rather, it is enough that the individual is capable of accessing and controlling the substance. This concept is crucial in law enforcement and legal proceedings, as it impacts how cases involving controlled substances are adjudicated.

The other options presented do not denote possession in the same direct manner: finding a substance in a public place does not imply ownership or control; having a prescription for a substance does not apply if possession is illegal without another factor, such as whether one has the prescription physically with them; and using a substance on personal premises refers more to use rather than possession itself.