Hair tests are extremely accurate and the longer your hair the longer the history. Some say the test will go back 6 months but other sources say that the test can go back longer. If your hair is shorter then you can expect the history to be 6 months.
Hair is the type of thing where the substance will wash out it will stay there until it is cut off. If hair on your head is not available they will take it from other parts of the body. Many employers use this test to promote a drug free workplace or to get a discount on certain types of insurance.
THC can stay in your hair for up to three months. This means that if you have smoked weed within 90 days of a hair drug test, your use will be detected.
Blood tests are not the most effect means of drug testing because they do not go very far back. THC will stay in your blood and be detectable for up to 24 hours. You can find more information here: en.wikipedia.org/wiki/Drug_test#Detectio....
THC, a chemical found in marijuana, will stay in your system for as long as several months. You may be able to get it out of your system for a urinalysis, but it will still show up in your hair.
THC (Tetrahydrocannabinol) can stay in a person's body for as long as 3 to 90 days after smoking or being ingested orally.
THC will stay in your saliva for up to 24 hours. This means that a saliva drug test will be able to detect any use from this period of time.
Larry Robbins' Ira Sohn Presentation: Long THC, HMA, HCA, LPNT; Short ITC ~ market folly.
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