The roll-out of stun guns (pictured, file photo) to 500 guards follows a trial involving 20 officers - and the Ministry of Justice may extend the scheme to include hundreds more.

Justice Secretary ramps up measures to protect officers from upsurge in violence from ‘pernicious prisoners with malevolent intent’

The roll-out of stun guns (pictured, file photo) to 500 guards follows a trial involving 20 officers - and the Ministry of Justice may extend the scheme to include hundreds more.