Has changed relationships with family members or friends

Uses chewing gum or mints to cover up breath

Often uses over-the-counter preparations to reduce eye reddening or nasal irritation

Frequently breaks curfew

Has cash flow problems

Drives recklessly, and has car accidents or unexplained dents in the car

Avoids eye contact

Locks doors

Goes out every night

Makes secretive phone calls

Makes endless excuses

Has the “munchies” or sudden appetite

Exhibits uncharacteristically loud, obnoxious behavior

Laughs at nothing

Has become unusually clumsy: stumbling, lacking coordination, poor balance

Disappears for long periods of time

Has periods of sleeplessness or high energy, followed by long periods of “catch up” sleep

Exhibits mood changes or emotional instability

Sullen, withdrawn, depressed

Shows loss  of inhibitions

Silent, uncommunicative

Hostile, angry, uncooperative

Deceitful or secretive

Less motivated

Unable to focus

Hyperactive

Unusually elated

Unusually tired

Lethargic movement

Unable to speak intelligibly, slurred speech, or rapid-fire speech

Nosebleeds

Runny nose, not caused by allergies or a cold

Frequent sickness

Sores, spots around mouth

Seizures

Vomiting

Wetting lips or excessive thirst (known as “cotton mouth”)

Sudden or dramatic weight loss or gain

Skin abrasions/bruises

Accidents or injuries

Depression

Headaches

Sweatiness

Absenteeism or loss of interest

Loss of interest in extracurricular activities, hobbies or sports

Failure to fulfill responsibilities at school or work

Complaints from teachers or supervisors

Reports of intoxication at school or work

Disappearance of prescription or over-the-counter pills

Missing alcohol or cigarettes

Disappearance of money or valuables

Receiving unusual packages in the mail

Smell in the car or bottles, pipes or bongs on floor or in glove box

Appearance of unusual containers or wrappers, or seeds left on surfaces used to clean marijuana

Appearance of unusual drug apparatuses, including pipes, rolling papers, small medicine bottles, eye drops, butane lighters, or makeshift smoking devices, like bongs made out of toilet paper rolls and aluminum foil

Hidden stashes of alcohol

Smell of smoke or other unusual smells on breath or on clothes

Messy appearance

Poor hygiene

Red, flushed cheeks or face

Track marks on arms or legs (or long sleeves in warm weather to hide marks)

Burns or soot on fingers or lips (from “joints” or “roaches” burning down)