DUI Urine Testing
DUI Attorney Allen Trapp provided some great information on DUI urine testing. See the quote below with links to the post.
Urine Testing: The Basics: "Urine samples are usually tested for drugs by using a screening test followed by gas chromatography-mass spectroscopy (GCMS). The screening test is normally an enzymatic method of analysis that determines if the ‘signal strength’ is at or above a cut-off level. These tests employ reagents that interact with several different but related compounds (e.g., metabolites) and measure the total ‘signal strength’ of all those compounds. "
(Via Georgia DUI Blog.)