[chc]

Police go on fishing expeditions all the time. Just because they don't actually have proof of the thing they were looking for doesn't mean they can't find anything to hang you. I once had a traffic stop evolve into the officer telling me I could either let him search my car or he'd call in a dog to give him probable cause. There really wasn't anything for him to find, but he doesn't have any reason not to play the odds.

[gingerrr]

Luckily this particular practice is no longer legally sanctioned: https://en.wikipedia.org/wiki/Rodriguez_v._United_States

[gknoy]

It would be nice to have a card that lists these landmark decisions, so that when pulled over you have a way to quickly have handy the names of cases.

"If you don't let me search your car, I'm going to call in a dog ..." "Officer, the Supreme Court ruled in People vs Rodriguez (2015) that a traffic stop becomes unlawful if it is prolonged beyond the time reasonably required to complete the mission of issuing a ticket for the violation."

Of course, making such an argument at the time might be unwise, but at least you know that the law is on your side if you decide to decline the search.

[biot]

I've seen various apps for that, including an enumeration of your rights by jurisdiction as to whether you're required to show an officer ID, stop & frisk laws, etc.

[guard-of-terra]

Make one, sell it on ebay, profit.