The methods they use to test urine are enzyme immunoassay, radioimmunoassay, thin layer chromatography, and gas chromatography or it is sometime called mass spectrometry. With enzyme immunoassay a drop of urine is placed into the machine and it goes threw ten separate channels where each channel test for a different kind of drug. Radioimmunoassay adds antibodies to your urine so it can detect the drug that has been used. It separates all the free antibodies from the sample of urine. Thin-layer chromatography works with a glass plate that is covered with a thin layer of jellylike substance. A drop of urine is applied near one edge of the gel surface. The gel shows what kind of drugs are in the system. The Gas chromatography is the only test that claims to be 99.9 percent accurate. It is a $15,000 machine. It works by injecting a tiny bit

Some common words found in the essay are:
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Approximate Word count = 572
Approximate Pages = 2 (250 words per page double spaced)