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§ 40.93 What criteria do laboratories use to establish that a specimen is dilute or substituted?
§ 40.121 Who is qualified to act as an MRO?
§ 40.123 What are the MRO's responsibilities in the DOT drug testing program?
§ 40.409 What does the issuance of a PIE mean to transportation employers?
§ 40.97 What do laboratories report and how do they report it?
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