Step 1: seize property

Step 2: hold onto it for an indefinite period of time

Step 3: steal the property

Step 4: when the owner comes for their stuff, claim the property went missing

Step 5: wait for a lawsuit that usually doesn't come because the property isn't worth enough and nobody wants to get in a suit with cops for what's usually small claims

None of this is going to change unless you prevent cops from handling seized property.