I have been thinking about this dog/situation today, and I have to agree with Carmen.
From my experience, the selection process for a police dog in the UK is extremely rigorous. If any dog fails to perform in a desired way in any part of this process, it is dismissed and found a good pet home. In times of stress, a dog will revert to type and you cannot take this kind of risk in a working police dog, where lives may well depend on him.
I hope the dog in the original post finds a good home elsewhere, and it does sound as though he may be suited to some kind of work or sport home.