Yes they are free a day after the event. There are bound to be logs and with that the possibility of capture. The person or people who did this are not quite resting easy, well unless it was a foreign entity that did it... That would change things considerably.
Given the nature of how bitcoin works, however, they can easily move the money through exchanges in foreign jurisdictions, effectively laundering it. There'd be a trail, with logs, but it'd be inaccessible to investigators.
