[supercat]

What makes you believe bomb and drug dog handlers want false positives?

Because the fact that a car doesn't contain drugs doesn't mean it won't have something else of interest. For example, cops may know that people driving to or from a flea market are likely to have large amounts of cash. Drug-dog alert plus large amount of cash equals free money for the cop's department. Some victims may successfully sue to get their money back, but in most cases the robbers will get to keep it.

[Alaska Wolf]

Because the fact that a car doesn't contain drugs doesn't mean it won't have something else of interest.

So instead of actually looking for something substantial, you believe most cops would fritter away their time on a shot in the dark? Is that what you believe?