No I dont see the need for police in the Bitcoin Standard. Think about it as other assets... someone breaks in and steals your TV or your watch collection etc. You call the cops and they investigate.

There are already several companies that track crypto transactions for industry like Chainalysis and the police will partner with them to find where the funds went. I couple of these companies have developed ways to track through tumblers as well so even if the thieves do that police can track it.