(1) Except as otherwise provided by this Decree, the court or jury may, in determining the credibility of a witness, consider any matter that is relevant to prove or disprove the truthfulness of his testimony at the trial.

(2) Matters which may be relevant to the determination of the credibility of the witness include, but are not limited to the following:-

(a) the demeanour of the witness;

(b) the substance of the testimony;

(c) the existence or non-existence of any fact testified to by the witness;

(d) the capacity and opportunity of the witness to perceive, recollect or relate any matter about which he testifies;

(e) the existence or non-existence of bias, interest or other motive;

(f) the character of the witness as to traits of honesty or truthfulness or their opposites;

(g) a statement or conduct which is consistent or inconsistent with the testimony of the witness at the trial;

(h) the statement of the witness admitting untruthfulness or asserting truthfulness.