I used to work in a restaurant in the bar district of a college town. Often, I would see the cops pull people over and have the drug dog sniff around the car. The drug dog seemed to always indicate drugs. The cops would tear apart the car, and 90% of the time, find nothing and leave the driver with all of his stuff scattered around the parking lot.
IIRC, the supreme court ruled on this a few years ago, and found that the drug dogs were valid to use as "probable cause". As far as I can tell, their definition of "probable" is different than mine.
and yes, I understand that my post misses the point of your post, but I thought I would include my little anecdote.
There should be some disincentive to search. Like if they don’t find anything, they have to pay to put it back together, rental car, lost work, and a little on top for vig. Course then the searches would have to be supervised or they would never fail to “find” what they’re looking for.