To find money being exchanged in a brothel:
A large amount of the window prostitution in Amsterdam's red light district will be shut down as the city council gets tougher on criminal activities.
Amsterdam City Council said investigations had revealed about one-third of the prostitution sector is allegedly involved in money laundering.
About 100 of the 350 prostitution windows in the Dutch capital's red-light district will be forced to close by the end of the year.
....Amsterdam introduced a new law in 2003 which made it possible to investigate the operational management in the sex industry.
The new law was designed to prevent authorities unintentionally supporting criminal activities by issuing permits and subsidies.