Acting coherently, seemingly not drunk, with a very high alcohol BAC may indicate an increasing tolerance. Drinking more and more to feel the desired effects of alcohol is also a sign. This could be very dangerous especially damaging the liver.
I am not proud to say, more grateful than anything, but I had a .42bac with an OD on BP meds...family was called in to the ER after my BP plummeted...not to rationalize it but thank goodness I wasn't driving....but still very well could have hurt people.
I have been there also with the DUI's, jail, fines, disgrace, IOP, huge ins. premiums...both still remain on my record.
I have hurt a lot of people in my life....today sober I don't and have righted the ship with amends and good living.