How long does cannabis stay in your system?
Cannabis can stay in your system for up to 90 days after your last usage. This, however, depends on the method of ingestion, frequency of use, amount consumed and the type of test being used to screen for the drug.
Most people ask this question either because they are concerned about a drug test at work, or while driving. We’ve written an article with everything you need to know about cannabis and driving.
While there isn’t any official or firm answer to how long cannabis stays in your system, below we’ll outline what the research says based on multiple variables:
Type of tests
The type of drug test you take will have an impact on how long cannabis can be found in your system. Even the calibration of the drug test being taken matters. We’ve listed the standard test below in the shortest to longest amount of time cannabis can be found. It’s also important to note that Saliva can only detect THC and not CBD.
How long does cannabis stay in your saliva?
Most research shows that cannabis can be detected in your saliva for up to 24 hours after use, however, a few tests have shown up after 72 hours of use. For chronic users, this could be longer, and smoking is more likely to show up longer than edibles.
Can cannabis in pill form be detected by a saliva drug test?
Professor Ian McGregor was quoted saying, “If you take it in a capsule, it will bypass your saliva.”
It’s also important to note that recent studies have shown that saliva tests are showing false positives from 5 to 10% of the time. So, if you have been prescribed cannabis in pill form, you really need to be careful to make sure that you’ve waited a safe period of time before driving.
How long does cannabis stay in your blood?
Blood tests for cannabis, as with other methods, will depend on the frequency of use. For low use individuals, cannabis can stay in your blood for up to 24 hours. For frequent or regular consumers, cannabis can stay in your blood for up to 72 hours.
How long does cannabis stay in your urine?
As with other methods of testing, research on this method varies, however, urine tests are the most used and can detect THC-COOH for up to and exceeding 30 days. A 2017 study by the Mayo Clinic’s gives the following breakdown:
- Occasional users (up to three times a week): 3 days
- Moderate users (four times a week): 5 to 7 days
- Chronic users (daily): 10 to 15 days
- Chronic heavy users (multiple times a day): more than 30 days
How long does cannabis stay in your hair?
Since hair grows approximately 1.3cm per month, a 4cm hair removed from close to the scalp can potentially provide a window of cannabis use for the past three months or 90 days. However, a study conducted in 2015 showed that hair follicle drug testing correctly identified only 52.3 percent of people who reported recent marijuana use.