Hannibal by Jean-Michael Basquiat, is the most expensive piece of art sold at auction.
However, it has also become the poster child for those concerned that the art market is being used to clean dirty money.
The international anti-money laundering body The Financial Action Task Force says it is impossible to produce a definitive estimate of the amount of money globally laundered every year, because the illegal nature of transactions involved means precise statistics are unavailable.
Voice over by Miranda Hinkley.
AAT Comment offers news and opinion on the world of business and finance from the Association of Accounting Technicians.