'De-stressing police saves lives'
Media playback is unsupported on your device

'De-stressing police saves lives'

New techniques are being used to train police officers to stay calm to try to cut the number of people shot dead.

This video has been optimised for mobile viewing on the BBC News app. The BBC News app is available from the Apple App Store for iPhone and Google Play Store for Android.

  • 09 Dec 2016