Well sadly yes, criminal or coruptor using the money and buy bitcoin for money laundry. I'm sure at least 1 person already do that out there but i think people already smart nowdays and police are know about bitcoin and can detect it if the suspect caught using bitcoin or have a bitcoin wallet.
although as it is actually this bitcoin can be done in transaction tracking. many people who meggas for the regulation is the only aim to get data every person who has a wallet. and prevent money laundering