![]() This test is cheap and has a wider detection time frame than similar tests conducted with blood or saliva. This means of drug testing is by far the most common for pre-employment screenings and law enforcement. Upwards of 90 percent of all drug screenings are done by urine analysis. THC metabolites in particular linger in our bodies for long periods of time, making blood tests harder for long-term pot consumers to pass.ĭue to the invasiveness and expense of these tests, they’re not common outside of the justice system or professional athletic programs. Blood Sample Analysisīlood tests are the most intrusive, most accurate, and the most expensive drug tests to conduct. These tests measure the cannabinoids in your blood stream, but they can also gauge the chemical impairment of the test subject.īlood tests can detect the presence of parent drugs, not just their metabolites, in our systems. Hair tests have the longest window of detection and can show a history of cannabis use, usually about 2-4 months.Ī chop-stick diameter piece of hair, about an inch and a half in length, is taken for testing. This length of hair allows lab technicians to look for traces of cannabinoids, as well as a wide range of substances accumulated in the hair shaft.įalse positives can occur if the test subject had walked through second-hand marijuana smoke. Experts have even warned that certain ethnicity's hair types are more susceptible to false positive results through outside contamination. Hair follicle tests detect a drug metabolite that’s diffused from the bloodstream into the follicle. These tests cost anywhere between $15-$75, so they’re fairly inexpensive. There’s also no standard testing threshold for delta-9 THC, so results can depend on the brand of test. This is a different metabolite than other tests look for. Saliva tests are also looking for activated THC, also known as delta-9 THC. These tests are non-invasive, and relatively easy to administer, though they can result in false positives through improper handling. Oral swab tests have the shortest window of detection and are only useful in detecting recent drug use. The accuracy of this type of test is questionable because of possible contamination as a result of the placement on the skin. Test subjects wear a patch on their skin for a period of hours or days and the patch is sent to a lab for analysis. Sweat tests are fairly uncommon they’re often used by high school athletic departments for student tests. The most common forms of laboratory drug testing are: If you’re expecting to be drug tested and aren’t sure if you’ll pass, there are at-home drug tests you can use to determine if you’ll pass or fail. A home test may be your best option to check your THC metabolites before you submit to a drug screening that could have possible negative consequences if you get a positive result.īut before you buy an at-home drug test, it’s important to know how accurate home drug tests are, and what kind of drug test you’re going to need to pass. How Can I Get Weed out of My System Faster?.At-Home Results Compared to Lab Results.
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