sounds like you should send these patients to an ACGME certified pain physician...
okay, sorry to sound like an arse, but the guidelines have been neutered because doctors (under the influence of Big Pharma) have lobbied against any such definitive statements. the CDC guidelines, the FSMB guidelines, all state to "use caution" or "consult an addiction specialist" before initiating, etc. none come out and state "do not prescribe". that is the physician judgement.
otoh, the DEA will be more than happy to look in to things if your patient ODs on a combination of alcohol and your prescribed opioids.
I have had Legacy patients that I found were using alcohol consistently. they were initially counselled. screening and monitoring was increased. some ended up with dose reductions, and complete cessation was done in quite a few.