On the constitution.
Let’s see how that works
YOU vote in the legislators
The legislators made the laws of civil asset forfeiture- which say yiu can not keep gains from criminal activities.
The courts rule on the laws of civil asset forfeiture and have upheld them ((SCOTUS re Culley vs Marshall) under the Constitution.
The cops merely enforce what everyone agreed on per the checks and balances of ibid.
You never read a TOS before signing it, either do you.