Have you been here before? You had one drink, or maybe a few. Some time has gone by and perhaps you had something to eat, so you feel okay to drive. Suddenly lights are flashing behind you and now you're not okay. How did you get here? Maybe you rolled through a stop sign or ended up at one of Chicago's DUI checkpoints. Whatever caused the officer to pull you over, he tells you to blow into a Breathalyzer and the next thing you know, you're accused of driving drunk.