Change in attendance in school or work
Change in the normal capabilities in school/work
Abrupt changes in overall attitude
Generally lazy, irritable, discourteous, aggressive
Usually untrustworthy and lack self-confidence
Manipulative
Have a distorted view of reality
Low frustration tolerance
Con-game player
Lacks interest in his studies/work (withdrawal from responsibilities)
Blames everybody but himself (blame tosser)
No respect for the rights of others
Prefer to stay with peers (barkada)
May frequently go to odd places (to take drugs)
Poor physical appearance (unconcerned with grooming and hygiene)
Wearing of sunglasses at inappropriate times
Unusual effort to cover arms to hide needle marks (long-sleeved garments)
Stealing items which can be readily sold
Unusual borrowing of money from relatives and friends
Association with known drug abusers