the responsibility to be sure that their
             testing procedures are the most accurate available.
             Employers also need to bear in mind that the smoking of a single marijuana cigarette at a New Year's Eve party should not cause an employee to lose his job and his reputation three months later in March. They also need to know that watching an employees performance on the job could show that he has a problem with alcohol, cocaine or hallucinagenics that might not show up on a test.
             The use of a second, confirmatory screening of positive drug tests is a procedure widely agreed upon as essential for reliable test results. However, Cropanzano and Konovosky (1993) cite a survey finding that of 177 organizations that do drug screening, 32% relied only on
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