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How Long Marijuana Stay in System

Marijuana is the most popularly used drug in the United States and in many other countries across the globe. It is a mild drug and is especially popular among school and college goers. In the common language it is known as pot and can either be smoked in or ingested orally. Tetra hydro cannabinol (THC) is the psychoactive element in pot and is the reason for the effects of the drug – increased optimism and of being in control of the situation around, an increased heart rate and a changed blood pressure.

A drug test for pot is most likely to be a urine test. Retention time is the duration for which a drug is retained in the human system. This time is different for different drugs. Even for the same drug, retention time in different body fluids is different. Retention time is greatest in the case of hair. This is because drug residues are stored at the base of the middle concentric layer of the hair, making it difficult to tamper with them. So if you have a hair test coming up you should know some basic hair follicle drug test facts. And the most important of these is that the only way to beat a hair test, even if you use drugs, is to have your hair shampooed by a masking shampoo. These shampoos conceal the drug residues in the inner layer of the hair by first opening the outer layer.

The question: How long marijuana stays in system has many answers. THC is fat-soluble. Retention times for pot depend on the age, gender, height, weight, percentage of body fat, body size, fluid intake and metabolism of the user. Drug use habits like the frequency and amount of drug use and the duration for which the user has been using the drug also play a role in determining the retention time. A urine test can determine pot use for 10 days, 45 days and 90 days after it was last used respectively for occasional users, regular users and chronic users. The corresponding periods for blood test and saliva test are 12 hours – 7 days and 24 hours respectively. A standard hair test can detect pot for 90 days after it was last used, while advanced versions can go back up to 3 years.