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The DER should be knowledgeable about the substances that are tested for in their workplace and be able to spot the signs and symptoms of use or impairment associated with these substances. There are a number of variables that dictate which substances are tested for. This will depend on whether the workplace is federally regulated... View Article

Who and When to Test Under DOT
The DER and Company Policy
Back to: Designated Employer Representative (DER)Compliance Training

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