The legitimate use of medication for physical or psychological problems can distort an innocent subject's behavior.

• A. True
• B. False
• C. Legitimate use of medication can distort innocent subjects' behavior
• D. Only for physical problems

Answer: (C)

Medications can alter how a person behaves, even when they’re used legitimately to treat physical or psychological problems. This matters because drug effects and side effects can change mood, alertness, or judgment in ways that might look like deception or unusual conduct, even though there isn’t any intent to mislead. The best choice is the one that states this possibility outright: legitimate use of medication can distort innocent subjects' behavior. It directly acknowledges that medical treatment can influence behavior, which is the key idea you’re being tested on. For example, sedatives or opioids can slow thinking and reactions, antidepressants can modify mood, and stimulants can cause jitteriness or agitation; all of these can affect how someone behaves in an interview or observational setting. The other options miss or misstate this nuance: they’re either just labeling the statement as true without tying it to legitimate use, or they restrict the claim in ways that aren’t accurate.