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Are drones opening up a new front in the struggle to stop cross-border contraband?

Presenter Ed Butler speaks to Matt Scassero, head of the University of Maryland's Unmanned Aircraft Systems Test Site, as well as to Richard Gill, founder of the company Drone Defence, which seeks to stop miscreant drones in their flight paths.

Also in the programme, Tamasin Ford reports on the desperate cocoa farmers in Cote d'Ivoire who are resorting to smuggling their produce into neighbouring Ghana in order to secure a price they can live on.

(Picture: Drone carrying payload; Credit: Oktay Ortakcioglu/Getty Images)