Police Powers and Responsibilities Act 2000

This section applies if a police officer reasonably suspects a person—

has committed, is committing, or is about to commit an offence punishable by life imprisonment; or

has committed an offence punishable by life imprisonment and is attempting to escape arrest or has escaped from arrest or custody.

This section also applies if—

a police officer reasonably suspects a person is doing, or is about to do, something likely to cause grievous bodily harm to, or the death of, another person; and

the police officer reasonably suspects the officer can not prevent the grievous bodily harm or death other than in the way authorised under this section.

It is lawful for the police officer to use the force reasonably necessary—

to prevent the continuation or repetition of the offence or the commission of another offence punishable by life imprisonment; or

to apprehend the person; or

to prevent the escape of a person from arrest or custody; or

to prevent the commission of an act mentioned in subsection (2).

The force a police officer may use under this section includes force likely to cause grievous bodily harm to a person or the person’s death.

If the police officer reasonably believes it is necessary to use force likely to cause grievous bodily harm to a person or the person’s death, the police officer must, if practicable, first call on the person to stop doing the act.