Lack of good judgement on the part of the police force.
If ANYONE who is required to drive s part of their job were to be arrested for impaired driving, they would be summarily FIRED! And if it was later determined to be a "wrongful dismissal", the driver could launch a lawsuit and let an independant civil court decide if it was indeed a wrongful termination.
In this situation, the police service themselves have set the example that drunk driving and almost running over police officers is forgivable, a not so serious "lack of judgement".
This must disgust good, law abiding cops.