Blood Alcohol Concentration (BAC) and Effects on Behavior
The effects of one drink—a 12-oz bottle of beer, 4-oz glass of wine, or 1-oz shot of hard liquor—vary depending on weight, ethnicity, gender, and other factors. Across most of the United States, a BAC of .08 is the legal limit for driving. But even at lower levels, our coordination and focus may be impaired.

Source: Centers for Disease Control and Prevention, 2011, February 11; (Photos: left & center) Danny Smythe/Shutterstock; (right) Thinkstock