Driving with a BAC level of 0.08 or above is a serious criminal offence and it attracts severe Texas drunk driving penalties. For commercial drivers, the BAC limit is only 0.04, and for under-21 drivers, it is 0.02 only. Following is a brief rundown on how the penalties are awarded on each conviction. However, it is just a general review. It is often better to consult with an experienced Texas dui attorney to get more detailed information on what you should expect in your specific case.