Forbes Eight Warning Signs That YOUR Teen Is Using Drugs

Dr. David Lewis, medical director of Visions Adolescent Treatment Center in Malibu, Calif., says that poor performance in school is also a major clue. Numerous tardies might also mean kids are using between classes. Comments from teachers about a child's attention level may indicate that he or she is attending class under the influence.

Visions Adolescent Treatment Centers Medical Director, Psychiatrist M. David Lewis MD, FSAM - quoted on the Forbes Magazines Website