Right, the losing money part is not the casino's business but serving alcohol to clearly drunk people is and applies to bars also, I think. But, since this is the topic, I'm going to relate one of my favorite stories:
Years ago, at Casino Arizona, we had a 15-30 Stud game. I showed up one night and the only seat was to the right of a stranger who had all of the chips. There are 2 ways to have all of the chips: Play bad and get lucky or play good and get lucky and there are more ways to play bad. It took one hand to see what was going on. Every time the action was on him he'd bet or raise, nothing else and he had a drink in his hand. Of course he was getting huge action and winning nearly every hand, a real ride up on the variance rocket. Every time the waitress came over he'd order a double scotch. Then the inevitable: He started to lose and when he'd gone through 3/4 of his chips he reached into his pocket and pulled out a piece of paper.
The front of the paper was headed 'Tucson Alcoholics Anonymous' (Tucson being about 1.5 hours south) w/ a list of names that he started calling. He turned the paper over and it said 'Tucson Gamblers Anonymous' and he called some of those numbers also. Then he started winning again, his phone started ringing, he wouldn't answer, I mentioned the ringing phone, he said he didn't want to talk to those people, so I dropped it.
A bit later the waitress came over and he said something like 'Imddghirugh.' She says 'What?' He said 'kkwoduyyf'! She says 'What?' So I say that he wants a double scotch. It's CAZ policy to kick you out at that point and I saw her talking to a manager but I also noticed the casino manager (who knew me a bit) standing there and went over and told them that they couldn't let him get into a car, it would be the same as murder so they just cut him off.
I prob saved somebody a really bad time.