Sounds like a set-up. They did the same to a legislator from New Jersey and now a cop is facing criminal charges for it.
Just because he failed a sobriety test does not indicate he was under the influence. I do not drink, nor use any narcotics, cold medicine nor any other medication which could impair my driving, but that does not mean I can pass a field sobriety test. Having been an LEO, I know the FST. Running a red light... hmm.. classic!