Drug testing normally begins with a quick and inexpensive screening test, using a sample of urine, saliva, or a swab taken from your skin. Most employers use a urine test. Screening tests are moderately reliable; they usually give an accurate result negative or positive for a particular drug. But, they can mistake other .
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1. IntroductionThe liquid chromatography-mass spectrometry LC-MS technique has great potential in urine drug testing by offering methods capable of replacing .
3,4-Methylenedioxymethamphetamine MDMA , commonly known as ecstasy E , is a psychoactive drug used primarily as a recreational drug. The desired recreational .