As has been stated sport is sport and police work is police work. We can and do use sport titled dogs however, a lot of work must be put into the dog for him to be streetworthy. The dog must be civil, have muzzle work, we trail, not footstep track etc. Your basic sport dog is in no way streetworthy without a lot of additional training. It is a good foundation. I am familiar with Diehl and have several Eurosport k9 dogs. I just imported an SVV1 bitch bred to Ozzy Barnero. I am training her for human remains detection as well.
As far as a pup. As has been previously stated they are a crap shoot. For scent detection work the retrieve/hunt drive must be over the top. The dog must have rock solid nerves and a nice balance of prey and defense drive.