“Whether you drove home too soon from the bar or went cruising with a joint, drunk driving laws in each state and in the District of Columbia criminalize the act of driving under the influence of alcohol or other impairing substances. In the United States, drivers are presumed drunk if they have a blood alcohol concentration at or above the federally recommended blood-alcohol concentration (BAC) of 0.08 percent, although many states have lower limits for commercial drivers and underage drivers.” Read more at Drunk Driving Law on LawInfo.

Personal Note: Don’t drink and drive. I’ve never used any of these services, so I can’t speak to their quality/safety/etc., but if you’re in need of a ride home, check out: National Directory of Designated Driver Services.