Denial and more denial
Disrespect of parents & family
Items missing from home
Finding strange items in their room and
clothing
Falling school grades
Coming home late
Sleeping late and long
Isolating from family members
Dropping out of sporting & other
extra-curricular activities
Always asking for money
Unexplained new clothing & other items
Increase or decrease in appetite; changes in eating habits, unexplained
weight loss or gain.
Smell of substance on breath, body or clothes.
Extreme hyperactivity; excessive talkativeness.
Needle marks or bruises on lower arm, legs or bottom of feet.
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; forgetfulness.
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.