How long does marijuana stay in your hair follicles?

THC: Thc can usually be detected in hair testing at 90 days.

Depends on use.: It depends on how often you use it. If you used it only once it can be detected by blood for 12-24 hours while it is detected in urine from 1-7 days. With regular use it can be detected in blood for 2-7 days and in urine anywhere from 1-100 days even if a heavy user. Age, height, weight, metabolism all are considered factors.

Pot: Up to 90 days.

Possibly for: Months. ' hair tests are more likely to detect regular than occasional marijuana use. One study found that 85% of daily users tested positive for marijuana, versus 52% of occasional smokers (1-5 times per week).' per 'pharmacokinetics of cannabinoids' by mcgilveray ij. .

Depends.: If you are a regular user, it can be detected up to 3 months.