Invalid result.

Invalid result. The result reported by a laboratory for a urine specimen that contains an unidentified adulterant, contains an unidentified interfering substance, has an abnormal physical characteristic, or has an endogenous substance at an abnormal concentration that prevents the laboratory from completing testing or obtaining a valid drug test result.

Source

49 CFR § 40.3

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Scoping language

In this part, the terms listed in this section have the following meanings:

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