"Civil forfeiture" (without a criminal conviction) will eventually be (correctly) seen as theft, but SCOTUS is currently at a low ebb of competence. Let's see how they do with with the "Muslim travel ban" (the one that exists only in the judge's mind).

Many States allow forfeiture of any cash you're carrying (generally $100 and up, especially if in small bills, or not in small bills) if stopped for traffic offense because "it's the result of a crime" (drugs) that:
1. doesn't exist
2. you're not charged with
3. you don't get a receipt for the money (no date + illegible signature = good luck with that)
4. isn't permitted by statute, it's just "police policy"
5. kept by the police

BTW: in Nassau County NY if the police don't like you they suspend your pistol license. No criminal accusation is necessary (let alone a conviction), you're "psychologically unsuited", and they keep all your guns. No, it's not even their policy, they just do it. If you don't hand them over, they come to your house and arrest you.