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Many different factors affect drug detection time in drug testing. For example, for fluid testing (urine, blood, saliva) your height, weight, physical activity, and eating habits can affect the results. Hair testing is very expensive but your longer hair could hold drug usage indicators for two to three years. That's why they say that hair is a road map of drug usage. The ends of your hair hold remnants of what you used longer ago, and as you move closer to your scalp the most recently introduced drugs and chemicals can be found.

Approximate times, Cannabis (marijuana) can be detected through testing:

Single Use:

Blood Test: 2-3 days

Saliva Test: 12-24 hours

Urine Test: 2-3 days

Hair Test: Up to 90 days, depending on how long your hair sample they use has been growing.

Continual or very frequent use:

Blood Test: 2 weeks

Saliva Test: 12-24 hours

Urine Test: Up to 12 weeks (3 months)

Hair Test: Up to 90 days (see above)

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