We’ve covered how to pass a drug test for marijuana before. But, how long does marijuana stay in your system is the most frequently asked question that we receive. While there is no definitive answer, we have presented some guidelines.
The data used to create this infographic is gathered from research on drug testing methods and the information presented by drug screen manufacturers. Some resources include Redwood Toxicology, Cannabis Drug Testing, California NORML. The information presented is only a guide or estimate since drug testing has many variables that can influence a positive or negative outcome. The only way to really know if you are positive is to test yourself. You can test yourself with a cheap test by buying a THC urine drug test.
The most common tests used are a urine drug test, saliva drug test and hair follicle drug test.. Each test has a different detection time which is important to know. The urine test is the most commonly used because it is cheap and has a longer detection time than a saliva test. There are several very important factors that can influence how long THC will be present in your urine:
- Body Fat
- Amount Used
- Frequency of Use
Since these factors will vary greatly for each individual, there are no definitive guidelines to tell you how long you can test positive for THC.
On a Urine Drug Test, THC will appear as a positive within 2-5 hours of use. How long it will still show on a urine drug test is estimated based on frequency of use, but does not take into account the weight and body fat of the marijuana user:
- One Time User may show positive for 1-6 days
- Moderate User may show positive for 7-13 days
- Frequent User may show positive for 15 or more days
- Heavy User may show positive for 30 or more days
- Some Heavy Pot Smokers have reported being positive 45-90 days after quitting
On a Saliva Drug Test, THC will test positive within one hour of use, but you may have marijuana in your system for about 12 hours after last use.
How long does drugs stay in your hair? On a Hair Drug Test, THC will show up about 7 days after use and most hair drug tests will test for a 90 day period. However, THC does not always bind to the hair follicle which makes it not always considered an accurate testing method for marijuana use.
The most reliable way to know if you are testing positive for marijuana use is to drug test yourself.