By tentative employer I mean either them; or, their agent. Either way, prescription labels are easy to counterfeit; so, I'd be really surprised if he didn't have to present something from either the prescribing authority (Dr., PA, RNNP) or the pharmacy that filled the prescription.
The testing agency may simply ask him to sign a release form and to give them the name of his prescriber if he has control over his own medical records. Any way you look at it, the responsible party has to authorize release of medical information and it's best to give those releasing it a heads up to prevent delays.
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