The State Police Complaints Authority and District Police Complaints Authority shall, while investigating any matter under this Act, have all the powers of a civil court in trying a suit and in particular, in respect of the following matters, namely:-

(a) summoning and enforcing the attendance of any person from any part of the State and examining him on oath;

(b) requiring the discovery and production of any document;

(c) receiving evidence on affidavits;

(d) requisitioning any public record or copy there of from any court or office;

(e) issuing Commissions for the examination of witnesses and documents; and

(f) any other matter which may be prescribed.”