Medically reviewed by Mary Choy, PharmD Key Takeaways 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 ...

Pre-employment drug testing is often industry-specific. Workers in what are deemed to be “safety-sensitive” positions are often required by law to undergo a drug test as part of the hiring process.

Science Is Having a Hard Time Determining How High Is Too High to Drive A study says THC blood tests aren't helpful for determining driving limits for marijuana.