It's not published. It's common knowledge among those trained in addiction medicine. in the literature of addictionology, 0.20 or more demonstrates TOLERANCE (I'd be on a respirator. But attempting to drive a car at 0.20...something has changed, hasn't it). As late as 2009 the limit was 0.25 but that's long since gone. And escalating TOLERANCE is one of the part 67 criteria for (under the aviation definition of) alcohol dependency.
So there are many out there bitching "dependency? on ONE DUI ! W_F!"
Sorry, Charlie: that just means that person more than likely, has been drinking long and hard and just got caught just this once....after all that's the common route to tolerance--"PRACTICE, PRACTICE, over time!".