The data used to create this info-graphic 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.
How long does THC stay in your system?
The most common drug tests used are urine, saliva and hair. Each test has a different detection time which is important to know. The urine drug 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
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 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.
Courtesy: The Weed Blog