Yes, bitcoin could absolutely used in money laundering. even thought the bitcoin network is transparent enough to show all the transaction in a ledger that is publicly available. The owner of each address could not be identified. Even there is KYC in several private company that involves in bitcoin, most of the user could create their own address using their own PC. Thus, no one could identify who and where is the location of the bitcoin address account. By then a person could conceal his or her private information, but can't conceal the amount of bitcoins.