The length of time that THC stays in your body depends on how long, and how much the person smoked. THC is stored in the fat of the body and can remain there for up to as long as 6 weeks.
THC is the active ingredient in the illegal drug known as marijuana. When THC is ingested it is quickly sent throughout the bloodstream, it then attaches to receptors in the brain that create a high effect. Depending on several factors, THC can stay in a person's body anywhere from 3 till 30 days.
You can find more information here: drugabuse.gov/Infofacts/marijuana.html.
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 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.
THC, as well as marijuana, cocaine, and heroin, can not be detected in saliva 24 hours after use. There are other drug tests, such as a hair follicle test, which can accurately track historical drug usage.
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