http://www.popsci.com/technology/article/2013-02/privacy-and...
http://www.popsci.com/technology/article/2013-02/privacy-and...
No patrols, no police drone leaves the ground without a warrant targeting a specific person or group.
I won't bore you with the full explanation of who won or why, but what I found interesting is that the dog's past performance comes in to play, the results of their testing, time in the field, etc. Also, the k-9 (human) officers are supposed to keep a record of their results to be provided should this come into question (which raises all sorts of things about false positives, false negatives, etc., due to ignored reporting of incidents that didn't otherwise generate paperwork).
I'm wondering now if there shouldn't be some similar standard of proof for police officers. I've never had the "smells like pot in there" pulled on me for any reason, but I almost hope that it happens at some point so that I can poll the officer's record to see how many times he's used that line as probable cause and what the feasibility of that is.