Word: immunoassay
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...most widely used new urine test, known as EMIT (for Enzyme Multiplied Immunoassay Test), is believed to be 97% accurate in the best of circumstances. But since laboratory workers often mishandle or accidentally contaminate the samples during analysis, the rate of accuracy may be considerably less. Because of such doubts, few companies fire employees or refuse to hire applicants on the basis of only one test. If the first test indicates drug use, employers generally try to confirm that result with a second urinalysis using a different laboratory technique...
Other objections to testing include the claim that it is used mostly as a way to control subordinates, while higher executives are rarely tested. And there are many complaints about faulty screening. For urinalysis, a test called Emit (Enzyme Multiplied Immunoassay Test) is the method most commonly used to detect drugs. Though its manufacturer, the Syva Co., describes it as 97% to 99% accurate, critics say it is far less reliable in practice, in part because samples are not always properly stored or handled by lab personnel. "From the point of view of analytical chemistry, these Emit tests are unacceptable...
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