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They usually only tell the employer if the test was 'positive' for a substance.
On top of that, there are two tests that are done. A thin-layer chromatography (assuming its urine). That test has a HIGH limit, something like 30ng/dl. That's like if you've smoked in the last week or so. If you test 'pos' on that test, then they use a Gas-Chomatography/Mass Spec. This has an insanly LOW limit, like 2-5ng/dl. If you test 'pos' on that one, then they ruled out a false 'pos' and notify the employer.
-SF
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