I agree that the incentive for a false positive on this privately contracted service is less than that for a law enforcement initiated search. But I disagree that there is no such incentive.
Parents aren’t shelling out $99 for peace of mind; this is not “trust, but verify.”
I submit they only contract this service when they strongly suspect their kid is in possession, and need the dog to have a “hit” to bolster their position when they confront their kid.
I would like to be a fly on the wall to observe the interaction between parent and K9 handler on those rare (10%) occasions when the dog doesn’t hit on anything.
I want to be a fly on the wall to observe the familial interaction when the dog exhonerates the kid. Does the kid ever even find out about the search? Are the parents’ suspicions truly allayed?