[IIAOPSW]

>or they just don't give a shit about false postives in the slightest and they use it as justification to randomly stop and search people.

We already have this. Look up the false positive rate of drug sniffing dogs.

[sathackr]

This. Easiest way to circumvent the 4th amendment. Get the dog to bark.

[ceejayoz]

Yup. Basically, it's Clever Hans (https://en.wikipedia.org/wiki/Clever_Hans) weaponized against the populace. Doesn't even have to be conscious on the part of the handler.