Dram shop laws apply to injuries suffered by third parties and do not apply to injuries to the intoxicated person.
I live in a city that is a destination for college trips and bachelor/bachelorette weekends, and an LEO I know has responded to many calls involving intoxicated individuals who were left at bars and on sidewalks by their companions because they were too drunk to keep up. It's not just the males who do this(!). He transported a passed out drunk guy to the hospital to get his stomach pumped and called the guy's wife (found # on his cell phone) three hours away to come get him. He wasn't required to call the wife but felt bad for the guy whose "friends" left him and were nowhere to be found.