One widely used method to pass a urine test is to buy synthetic urine and replace your sample with it, but this only works if you are not supervised. Stop smoking marijuana immediately! The longer you abstain, the better your chance to test negative. These two factors make it easier for them to beat a drug test. They also usually have faster metabolism. THC accumulates in fat cells, so thin people have less space to store it. If you smoke marijuana occasionally, you have a good chance to pass a urine drug test in less than a week.Ī person’s weight is also very important. Infrequent users eliminate THC faster, while it will usually stay in the system of frequent users for a longer period of time. The length of time depends on such factors as the age and weight of the individual, personal metabolism, physical activity, and amount and potency of the weed. You will pass a urine test for sure the next day.Įvery case is different, though, and too many factors influence THC half life, so we can only approximate how long marijuana stays in the human body. After smoking pot, your THC level in urine is about 100 ng/ml, but 5 days later it will be about 50 ng/ml. What we do know is that the half life of THC metabolites in the human body ranges between 1 and 10 days.Ĭonsider the following example: the half life of the THC in your system is 5 days. We can only calculate the approximate length of time. Unfortunately, it is impossible to say EXACTLY how long weed stays in your system. ( 3) If you want to pass a drug test, you don’t have to be absolutely clean, but you must have less than 50 ng/mL of marijuana metabolites in your system. For HHS-certified laboratories, the cutoff level (minimum concentration needed for a positive result) of THC metabolites in urine for the initial test is 50 nanograms per milliliter. This method is expensive but more accurate.ĭrug testing is regulated by the Department of Health and Human Services (HHS). If it comes back positive, a confirmation test is performed, which uses complicated gas chromatography–mass spectrometry (GC-MS).A lab takes a urine sample and mixes it with specific chemicals, usually just by dipping the drug test strip that is covered in chemicals into it. This method is commonly used for pre-employment drug testing, but it can also be used for other random drug testing, e.g., the workplace, schools, probation, and drug rehab centers.Ī lab-based urine test is performed in two steps: It is worth mentioning, however, that it detects not THC itself, but it's major inactive metabolite, THC-COOH. Urinalysis is the most common, cheapest, and simplest type of drug test. It can be detected by testing urine, saliva, hair, blood, sweat ( 1), or breath ( 2). Trans-Δ⁹-tetrahydrocannabinol, better known as THC, is the basic psychoactive component of the cannabis plant.
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