(1)A police officer may exercise all or any of the special powers of investigation under sections 21, 22, 34, 39 and 111 when investigating any arrestable case.

(2)The action of a police officer in such a case may not be called into question at any time on the ground that he or she ²⁰²¹lacked authority under this section to exercise the special powers of investigation under sections 21, 22, 34, 39 and 111.