They can take your money or property, and say you're going to commit a crime with it. Or that you got it by way of committing a crime. They need proof, but it's really not that hard. Once they have it, the burden of proof is on you to prove you didn't get it through criminal means to get your property or money back. Good luck with that.
Don't worry Americans, it won't happen here. They won't question you.
Law Enforcement can just take your money after withdrawal:
https://www.law.cornell.edu/wex/civil_forfeiture
They can take your money or property, and say you're going to commit a crime with it. Or that you got it by way of committing a crime. They need proof, but it's really not that hard. Once they have it, the burden of proof is on you to prove you didn't get it through criminal means to get your property or money back. Good luck with that.