Since the abolition of exchange control in the late 1970s and early 1980s, it has been possible instantly to transfer money of any amount or denomination virtually anywhere in the world. This means that, because criminal law is territorially based, and differs across jurisdictions, the investigation and prosecution of fraud and the related offences of money laundering and corruption are particularly dependent upon mutual legal assistance between states. Although many of the cases that have attracted attention in Britain in the 1990s are so-called “City frauds”, the authorities are dealing increasingly with very determined international criminals, who have taken to fraud and related offences as an easy way of making money.