Saliva Drug Check | Residence-drugtest.org
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Also known as a oral fluid drug test, it is intended to detect the presence of drugs in saliva. Saliva is mostly produced by three glands: the parotid, submaxillary and sublingual glands, together with other smaller glands. The amount of saliva produced can go from zero to several milliliters per minute depending upon several factors among which are hunger and a persons emotional state.
At times, anxiety during the testing procedure may result in a dry mouth syndrome and interfere with the collection of enough saliva with which to do the test.
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From: (saliva drug tests) http://www.home-drugtest.org/category/saliva-drug-test