For section 63B(1) of the Principal Act substitute —
"(1) The Chief Commissioner of Police may authorise the use by members of the police force of a device (a tyre deflation device ) that causes the deflation of the tyres of a vehicle—
(a) to prevent the use of the vehicle by a person for the purpose of escaping from lawful custody or avoiding arrest; or
(b) to stop or assist in stopping a vehicle in connection with the pursuit of the vehicle by members of the police force.".