To do that, dog should be handled by someone who is not their regular police handler. Then they would claim he doesn't know how to handle the dog properly, or doesn't have the required "soul bond" with the animal. Can't win against crooks.
> To do that, dog should be handled by someone who is not their regular police handler.
Not necessarily if the experiment is double blind. (Or tripple blind I guess because it is the dog, the handler and the on-site experimenter who are not aware of where the samples are hidden.)
