Alabama drunk driving penalties differ from fines and penalties in other states for dui convictions. The laws are specifically aggressive for drivers under the age of 21 and for school bus drivers; the BAC limit for them is only 0.02 percent (it is 0.08 for others). The laws are stricter for commercial drivers also; the BAC limit for them is 0.04. Following are fine sand penalties applicable for dui convictions in the state of Alabama.