A Breakdown of Marijuana Drug Testing

Marijuana breaks down into your system very rapidly. The active ingredient is Tetrahydrocannabinol- also known as THC. It can be detectable in the blood stream for only a few hours. The THC rapidly metabolizes into molecules known as metabolites which are then stored in body fat. The body releases the THC metabolites through urine and feces.

Urine drug testing is the best option when testing for regular marijuana use. A saliva drug test can be used to detect immediate intoxication of marijuana, such as for work place accidents and/or injuries.

The THC metabolites that are stored in fat can remain in the body anywhere from 20 hours up to 10-13 days. Although evidence suggests that the amount remaining in the body depends on how often the person smokes, the amount they smoke, and how long they have been using.

In a regular user, positive drug tests have be recorded up to 45 days after the last use. Heavy smokers have tested positive for up to 90 days after quitting.

The marijuana urine test is very effective. Often a positive result is tested again using a gas chromatograph mass spectrometer (GCMS), which is much more precise than basic urine panels. It is due to the GCMS as to why false positives are uncommon.

On the contrary for urban legends regarding drug tests, there are no substances that can turn a marijuana drug test negative into a positive. In the past there have been cases where Advil, Motrin and other over-the-counter medicine would turn a negative result into a positive result. The drug testing companies have since change the chemical composition of the tests to correct that problem.


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