Physical Symptoms

• Increase or decrease in appetite; changes in eating habits, unexplained weight loss or gain.

• Slow or staggering walk; poor physical coordination.

• Changes in sleeping habits -- inability to sleep, awake at unusual times; or unusual sleepiness, laziness, sleeping at strange times.

• Red, watery eyes; pupils larger or smaller than usual; blank stare.

• Cold, sweaty palms; shaking hands.

• Puffy face, blushing or pale skin.

• Smell of substance on breath, body or clothes.

• Extreme hyperactivity; excessive talkativeness.

• Runny nose; hacking cough.

• Needle marks or bruises on lower arm, legs or bottom of feet.

• Unexplained nausea, vomiting or excessive sweating.

• Tremors or shakes on hands, feet or head.

• Irregular heartbeat.

Behavioral / Psychological Symptoms

• Change in overall attitude / personality with no other identifiable cause.

• Changes in friends: new hang-outs, avoidance of old crowd, new friends are drug users.

• Change in activities; loss of interest in things that were important before.

• Drop in school or work performance; skips or is late to school or work.

• Changes in habits at home; loss of interest in family and family activities.

• Difficulty in paying attention; forgetfullness.

• Lack of motivation, energy, self-esteem, discipline. Bored, "I don't care" attitude.

• Defensiveness, temper tantrums, resentful behavior (everything's a hassle).

• Unexplained moodiness, irritability, or nervousness.

• Violent temper or bizarre behavior.

• Unexplained silliness or giddiness.

• Paranoia -- suspiciousness.

• Excessive need for privacy; keeps door locked or closed, won't let people in.

• Secretive or suspicious behavior.

• Car accidents, fender benders, household accidents.

• Chronic dishonesty; trouble with police.

• Unexplained need for money; can't explain where money goes; stealing.

• Unusual effort to cover arms, legs.

• Change in personal grooming habits.

• Possession of drug paraphernalia.