Possession of controlled substances refers to having illegal drugs or medications that are regulated by law. These substances are classified into different schedules based on their potential for abuse and medical use. For example, marijuana, cocaine, and opioids fall under various categories, with strict rules governing their use and distribution. When someone is found with these substances without a valid prescription or legal permission, they may face legal consequences. Penalties can vary depending on the type and amount of the substance, as well as local laws. Understanding these regulations is important for public health and safety.