(1)A constable has—
(a)all the functions conferred on a constable by virtue of this or any other enactment or by rule of law,
(b)all the powers and privileges of a constable throughout Scotland.
(2)A constable who is the chief constable, a deputy chief constable, an assistant chief constable or a local commander also has all the additional functions conferred on such a constable by virtue of this or any other enactment or by rule of law.