The operator (alone in the car) was drunk

  You are a police officer and just came upon a single-car accident at 3:00 AM in the morning, in a rural area with no houses, no witnesses, etc. The accident was caused because the operator (alone in the car) was drunk. As you approach him, he is conscious, uninjured and you realize he is an officer from your department. What are you going to do, and why?