Driving while under the influence of alcohol is illegal in every state in the United States. Drunk driving is generally defined as driving with a blood alcohol content (BAC) of above .08 percent; however, for the driver of a commercial vehicle this number is usually limited to .04 percent. In addition, zero tolerance laws in many states do not allow teenage drivers to have even a trace of detectable alcohol in their systems. A DUI or DWI charge can lead to the loss of a driver's license, jail time, fines, community service or a host of other consequences. Understanding the laws and penalties associated with drunk driving can help you to avoid a violation or to proceed accordingly if a violation has already been issued. Here, you will find a bulk of information on drunk driving that will help you make informed decisions.