Comments 12 & 13 definitely scary stuff. Will be checking these out. Thank you both kindly.
The police can and have taken cash off of people and told them that their money is suspected of being criminal and you have to go to court to prove your money is innocent.
You generally hear about it in the news when someone carrying a large amount of cash attempts to go through air port security and, even though carrying cash is not illegal and totally outside of their mandate, the TSA will call the cops who will show up and seize the cash. Perhaps they will stop doing that in the future as they have now been forced to pay court costs and damages in one case. But I would not count on it.
These are the cases you hear of.
The ones you do not hear of are the majority and they are people who are literally doing nothing wrong but carrying cash when they get hassled by the cops. The average amount of cash taken is $600.
Most people do not bother to go to court to try to get their money back because it would cost more to reclaim it then the amount taken.