>I want a german shepered dog but one that has been well trained.
Failed police dogs are just that partly/un trained dogs that have failed for one reason or another(too aggressive-too nervous-etc)you will not get a completely trained reliable dog this way. Are you aware that most police forces teach the protection work first at the same time as teaching control, because they only have 13 weeks in which to get the dog operational, whereas a civilian dog will not be trained for protection until it is fully under control.
A friend of mine works for the police dog section & the dogs they rehome are dogs that often fail the aptitude test due to aggression or nervousness & don't have any training at all. I certainly wouldn't want a police reject dog. What's wrong with an assessed rescue GSD ? Most GSD breed rescues(as opposed to an all breed rescue)will have assessed the dogs that come into their care & will experienced in placing the right dog in the right home. Some if not most will be house trained & basic obedience trained.
Why does the dog have to be
well trained already ? Half(well more than half IMHO)of the relationship you build with your dog comes through the training you do together