Comment by AngryData
People do illegal stuff all the time without even knowing it, that doesn't mean the cops and courts can't still fuck you over with it at any time. And even if you just had $20 in your pocket, a cop could seize it and claim they think it was used to buy or was going to sometime in the future buy drugs, and legally that is a completely valid reason even if you have zero drugs in your system and zero on you and were inside a McDonalds waiting in line to buy a burger.
> People do illegal stuff all the time without even knowing it...
If using and carrying cash was illegal, I wouldn't be able to go to -say- Wal*Mart and hand them cash in exchange for goods and services.
I agree that cops in many jurisdictions are permitted to engage in consequence-free-for-the-perpetrators highway robbery whenever they encounter someone carrying cash. The thing that's illegal in that scenario is the robbery.