Which substances are typically included in the Army's standard drug testing panel?

The Army's standard drug testing panel is designed to detect substances that are commonly abused and pose a significant risk to military readiness and personnel safety. The correct answer includes marijuana, cocaine, opiates, amphetamines, and PCP. These substances are specifically identified due to their potential for abuse and the negative impact they can have on soldiers' performance and health.

Marijuana is included because it can impair judgment and coordination. Cocaine and opiates (which include drugs like heroin and prescription pain medications) are known for their addiction potential and severe side effects. Amphetamines are stimulants that may enhance performance temporarily but can lead to dangerous side effects and dependency. PCP, known for its hallucinogenic effects, can lead to severe disorientation and dangerous behavior.

In contrast, the other options present substances that either don't fall within the Army's testing protocols (such as alcohol, tobacco, and prescription medications) or focus on less common drugs not typically included in routine testing (like heroin, crack cocaine, and methadone). Thus, the substances listed in the correct answer are consistent with the Army's focus on maintaining a drug-free environment critical for operational effectiveness and safety.