THC detection times vary by test type, lasting up to 12 hours in blood, 24-48 hours in saliva, up to 30 days in urine (on the longer side with frequent use), and up to 90 days in hair. How long THC ...

Medically reviewed by Femi Aremu, PharmD Key Takeaways A urine test can detect THC for up to 30 days after use.THC is detectable in blood for the shortest time, up to 12 hours, but can stay longer in ...