"Here you are son. This is a new invention which will protect you and the public from wrongdoers with intent to kill or maim you with a lethal weapon"
"What does it do Guv?"
"It's called a Taser son and perfectly safe to use and you wont have to use a firearm with lethal consequences and face a Coroner's court and be suspended from duty whilst investigated for manslaughter or even worse, Murder"
A week later,
"Come in son and close the door. That nutter you tasered last night when he slashed,with a machete,the WPC you were patrolling with has died of heart failure in hospital. You are suspended from duty until proceedings are considered to prosecute you. Hand me your warrant card and then you are dismissed."