Update: FBI app lures criminals into police hands - a podcast by BBC World Service

Hundreds of suspected criminals have been arrested after using an FBI-run messaging app. The joint operation with 16 law enforcement agencies worldwide was an effort to crack down on serious organised crime. Professor Robert Chesney, the Chair of The University of Texas's school of law, tells us how the sting operation worked. Plus Brian Dorst of Themis Trading brings us the latest news from the financial markets.

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