Sedative Hypnotic Drugs in the Commercial Driver

Can you direct me on where I could look for which prescription drugs are automatic disqualifiers with DOT and which are not? Me and another provider continue to dispute benzodiazepines and opioids and if the driver can pass the physical.  I think that the driver can pass if they are not having sedative effects with the medications.  He states that all benzos are DQ.

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