Lia Tabackman. This article was medically reviewed by Jason R. Our stories are reviewed by medical professionals to ensure you get the most accurate and useful information about your health and wellness.
For more information, visit our medical review board. Weed can be detected in urine between one to 30 days after your last use. Meanwhile, a saliva or blood test can only detect weed for a few days. The only way to get weed out of your system is to stop using marijuana products. Visit Insider's Health Reference library for more advice. Lia Tabackman is a freelance journalist covering health and science topics for Insider. She can be found on Twitter LiaTabackman.
How one study sparked the debate. Additional comments. Email optional. Public safety officials and employers have difficulty telling whether a person who tested positive has used cannabis very recently less than 12 hours ago or sometime in the past few weeks.
Lee, Hojeong Yu, a postdoctoral researcher at Harvard Medical school and lead author of the new study, and colleagues designed and built a new rapid cannabis testing system they named EPOCH. EPOCH uses an optical sensor to detect THC in saliva samples, where the compound's presence correlates more closely with immediate cannabis use than it does when detected in blood or urine. The sensor also includes features that allow the test to measure the amount of THC instead of only giving positive or negative results.
The whole system can yield results within five minutes and can be docked with commercially available smartphones. To measure their system's accuracy, the research team performed a proof-of-concept test with 43 users of either inhaled cannabis or THC-infused jelly and 43 non-users. The scientists gathered and tested saliva samples from the users within 10 minutes of use.
Results from non-users weren't affected by smoking cigarettes, drinking coffee, or other variables that might interfere with saliva test results.
Lee's team continued to track THC levels in the cannabis users after the first test. Opiates are not all made equal, so the amount of time they are present in the body can vary.
In general, heroin and many other opiates are detectable for 24 to 36 hours in saliva, which is shorter than the presence in urine or hair tests. Some opiates, however, may be detectable for a longer period of time. OxyContin, for example, is an extended-release variation of oxycodone, and thus stays in the body for a longer window of time. Many forms of opiates on the street, particularly illegally developed pressed pills, can contain unknown components and analogs, leading to more ambiguity in testing time.
Benzodiazepines, colloquially known as benzos, are used legitimately for numerous medical reasons, including addressing anxiety, insomnia, seizures, restless leg syndrome, Tourettes, and migraines. However, when used inappropriately, benzos can be highly addictive, leading to irresponsible use.
Due to the regular abuse of drugs like Xanax, a common anti-anxiety medication, benzodiazepines are frequently included in specialized drug panels. However, as the term benzodiazepine is a class of drug, there are numerous different substances that fall into this category and detection can vary greatly.
In general, benzodiazepines can be detected longer in saliva than via other testing methods, but the duration can vary greatly based on the drug in question.
For example, the metabolites of diazepam, nordiazepam, temazepam, and oxazepam, can yield detection up to 10 days after use as diazepam is a long-acting benzo. An intermediate-acting benzodiazepine like lorazepam is only detectable for around five days due to the increased speed in which the body metabolizes the present substance. Also known as ecstacy or Molly, methylenedioxy-methamphetamine is a common rave drug that is popular on college campuses and at parties.
Due to its common use, it is often included in a standard six-panel drug screening and can be detected in blood, urine, and and saliva tests. The life of MDMA in saliva is shorter than other testing methods, however; most traces will be gone within 24 hours. Alcohol is not a part of most blood or urine tests due to the rate at which it is metabolized in the body.
According to a review on cannabinoids in oral fluid, weed is detectable in saliva for the following amounts of time after last use:.
Weed 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. Hair follicle tests assess drug use for up to 90 days. After use, weed reaches the hair follicles via small blood vessels. Trace amounts may remain in the hair. Since hair grows approximately 0. The active ingredient in weed is a chemical substance called THC, which stands for deltatetrahydrocannabinol.
THC that enters your body is absorbed into the bloodstream. Some THC is temporarily stored in organs and fatty tissues. In the kidneys, THC can be reabsorbed into the bloodstream. THC is broken down in the liver. Drug tests look for these metabolites, which stay in your body longer than THC. Eventually, THC and its metabolites are excreted in urine and stool. A number of factors affect how long weed stays in your system. Other factors are related to weed and how you use it.
This includes how much you take dose and how often frequency. Higher doses and more frequent use tend to increase the amount of time it takes to eliminate weed from your system. More potent weed, which is higher in THC, may also stay in your system for longer.
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