Friday, November 02, 2018

How Long Does Marijuana (THC/Weed/Pot/..) Stay in Your System?

There is no perfect formula for determining exactly how long marijuana (THC/Weed/Pot/..) stays in someone's system during a urine, blood, saliva or hair drug test - let's look at what different factors can alter the number of days (varies from few hours to 90 days since last smoking Marijuana) THC will show up in an unexpected drug test.

People who smoked marijuana in the last:

  • 30-45 days can fail a urine drug test for THC;
  • 60-75 days can fail for a marijuana blood test;
  • up to 90 days can fail for a hair follicle drug test.

It’s no secret that marijuana is a commonly used, mostly-illegal drug in many parts of USA. Because of this, drug tests are often administered if there is suspicion of use or a past history of use. In order to understand how long marijuana stays in your system, it is important to understand what cannabis is, how it is used or abused and how it affects the body in relation to drug testing for THC.



The effects of smoking marijuana fade quickly, but the drug can be detected in the body for weeks and sometimes longer. The amount of time the active ingredients and breakdown products of weed remain in the system depends on how often or how much marijuana the user has been smoking or ingesting.

How long is it detectable via drug testing?


Drug tests measure marijuana and its by-products, or metabolites. These metabolites remain in your system long after weed’s effects have worn off.

Urine Drug Testing


According to Mayo Clinic Proceedings, weed is detectable in urine for the following amounts of time after last use:
  • 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.

Cannabis metabolites are fat-soluble, which means they bind to fat molecules in your body. As a result, it can take some time for them to leave your system.

Urine testing is the most common THC drug testing method.

Saliva Drug Testing


According to a 2014 review on cannabinoids in oral fluid, weed is detectable in saliva for the following amounts of time after last use:
  • Occasional users: 1 to 3 days;
  • Chronic users: 1 to 29 days.
Marijuana can enter the saliva through smoking and exposure to smoke. However, its metabolites are only present in saliva when weed has been smoked or ingested. In jurisdictions where medical or recreational marijuana is legal, oral fluid may be used for roadside testing.

Blood Drug Testing


According to Therapeutic Drug Monitoring, weed is typically detectable in the blood for 1 to 2 days. However, in some cases, it’s been detected after 25 days. Chronic heavy use increases the length of time that it can be detected.

Weed is detectable in the bloodstream within seconds of inhalation. It’s distributed to the tissues. Some of it is reabsorbed in the blood and broken down. Its metabolites may remain in the bloodstream for days. Blood testing may be used in laboratory settings or to indicate recent marijuana use.

Hair Drug Testing


Hair follicle tests assess drug use for up to 90 days. After use, marijuana reaches the hair follicles via small blood vessels. Trace amounts may remain in the hair.

How Long Does Marijuana Stay in Your System

Since hair grows approximately 0.5 inches per month, a 1.5-inch hair segment taken close to the scalp can provide a window of marijuana use for the past three months.

You may have a prescription for medical marijuana, or you may want to partake of weed or marijuana edibles in states where it is now legal. But there is no way to quickly remove the metabolites of marijuana from your system. You still face the risk of being charged with driving while impaired and failing employer drug tests and need to consider these consequences.

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