A parent, concerned about his child’s behavior, brings the teenager to the clinic where you are a medical technician. The parent is convinced the youngster is taking some kind of drug. If the parent is correct, what would you expect to find during the initial exam?

Drug use can affect the autonomic nervous system and change pupil size. Depending on the substance, the pupils may be unusually dilated or unusually constricted, so this is a possible finding during the initial exam. The other choices are not as broadly expected: blood pressure and body temperature can vary, and drug effects more often impair rather than speed reaction time.

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