There are many signs, both physical and behavioral, that indicate drug use. Each drug has its own unique manifestations but there are some general indications that a person is using drugs:

• Bloodshot eyes
• Drop in school grades
• Evidence of drugs or drug paraphernalia (e.g., needles, pipes, rolling papers)
• Excessive mileage on vehicle
• Fake ID (false driver's license indicating legal drinking age)
• Having more or less money than usual
• Hostile or argumentative attitude
• Lack of interest in personal appearance
• Legal problems
• Loss of interest in family activities
• Loss of weight
• Lying and/or stealing
• Marked change in sleeping patterns (getting more or less sleep)
• Memory loss
• New interest in drug culture (e.g. drug related posters, music or magazines)
• Rapid speech coupled with loss of appetite and excessive thirst
• Refusal or hostility when asked to talk about possible drug and alcohol use
• Smell of alcohol on their breath
• Stolen or missing household property
• Sudden change in friends
• Truancy and/or absenteeism from work