Police forces have always needed to be on top of new technology - both to monitor ways in which criminals may be exploiting it, and also to utilise new innovations for better crime-fighting.

BBC technology reporter Dave Lee was given a demonstration of some of the latest ideas, including 3D room-scanners and facial recognition devices.

He discovered that a person's online footprint is increasingly providing the vital clues needed to solve crime - but how does this affect our privacy?

Follow Dave Lee on Twitter @DaveLeeBBC