Which substances are identified by the presence of capsule pills and white powder?

The presence of capsule pills and white powder is most commonly associated with narcotics. This is because many narcotics are formulated in capsule form for ease of ingestion and dosage control. Additionally, illicit narcotics, such as heroin, are often found in powder form.

Narcotics, or opioids, can have potent effects on the body, including pain relief, sedation, and euphoria, and they are used medically but also have a significant potential for abuse. This makes them particularly relevant in discussions about fitness for duty, especially in contexts such as workplace safety, where the effects of these substances can impair an individual's ability to perform tasks effectively.

While stimulants, hallucinogens, and prescription drugs can also come in various forms, the specific combination of capsule pills and white powder is a hallmark of narcotic substances, making this choice the most accurate one related to the question.