How does a saliva swab drug test work?

Answer

A saliva swab drug test is one of the most ineffective drug tests used. Some of the chemicals in marijuana can be detected with a saliva swab test for 1-3 days after use and no more. You are given a spongy swab that is attached to a stick, very similar to a lollipop and you put it in your mouth for a few minutes being sure to rub it up against the inside of the cheek. The sponge is then tested for chemicals that may have been left behind from drug use.
Q&A Related to "How does a saliva swab drug test work?"
it does not.
http://wiki.answers.com/Q/How_does_a_cheek_swab_dr...
Metabolites are contaminants that get in your blood as a result of drug use. They can be tested for the type of drugs used, but not how much or how long they have been used. Metabolites
http://www.ehow.com/facts_5501908_do-saliva-tests-...
If your test is in 3 hours, you might be SOL. Good luck.
http://answers.yahoo.com/question/index?qid=200810...
The safe way is to simply not do drugs. However, you can by special...
http://www.chacha.com/question/how-can-you-pass-a-...
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