The issue focused on how many systems were subject to data capture. As well as software designed to provide technology for devices, digital cameras and phones are also being used in crime scenes.

In the capital of London, computer servers have been placed at large transport terminals. There is a drive-by shooting that left two people dead. No electronic device was taken. The victims' computers have not been captured.

But previous trials have found no evidence of machine cameras or smartphones getting into cars. In another case