What do dram shop laws allow a person injured by an intoxicated guest to do?

Dram shop laws allow a person injured by an intoxicated guest to sue the business that served the alcohol, the bartender who served the alcohol, and the business owner. The purpose of dram shop laws is to hold businesses accountable for serving alcohol to people who are already intoxicated, and to deter businesses from overserving alcohol.
Dram shop laws vary from state to state, but most states have some form of dram shop law. Some states also allow victims to sue social hosts who provide alcohol to intoxicated guests who later injure someone.