Power as to matters of evidence (House of Assembly)
Section 129(1)(a) · 1999 Constitution (2004 edition)
What Constitution says
(a) procure all such evidence, written or oral, direct or circumstantial, as it may think necessary or desirable, and examine all persons as witnesses whose evidence may be material or relevant to the subject matter;
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 66. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections