Most people know the legal blood alcohol concentration (BAC) limit to be able to drive when of legal drinking age (0.08). But that number seems a bit arbitrary unless you know when your blood actually reaches that concentration. It's easy to say, "I feel fine to drive," but remember that one of the first brain functions that alcohol affects is your judgment. In fact, your judgment is impaired at a BAC of around 0.05 to 0.06, when you are still under the legal limit. Just one more drink and your blood alcohol concentration may be well above 0.08, but you may still think that driving is a good idea. If you choose to drink, CHEW has developed cards to act as a tool to help you estimate your BAC when drinking. Remember, this is just an estimation and not fact. Many other factors can contribute to your overall BAC like whether or not you've eaten, body fat composition, body enzymes, illness or stress, and many other factors. Always err on the side of caution and never drink and drive. Find a sober driver (not most sober driver) if you know you will be out and drinking. Click on the BAC charts below (blue for males, red for females) to stay in the blue zone and Stop@Buzzed!