(1) This section applies only to credibility evidence in a criminal proceeding and so applies in addition to section 103.
(2) A defendant must not be cross-examined about a matter that is relevant to the assessment of the defendant's credibility, unless the court gives leave.
(3) Despite subsection (2), leave is not required for cross-examination by the prosecutor about whether the defendant--(a) is biased or has a motive to be untruthful, or(b) is, or was, unable to be aware of or recall matters to which his or her evidence relates, or(c) has made a prior inconsistent statement.
(4) Leave must not be given for cross-examination by the prosecutor under subsection (2) unless evidence adduced by the defendant has been admitted that--(a) tends to prove that a witness called by the prosecutor has a tendency to be untruthful, and(b) is relevant solely or mainly to the witness's credibility.
(5) A reference in subsection (4) to evidence does not include a reference to evidence of conduct in relation to--(a) the events in relation to which the defendant is being prosecuted, or(b) the investigation of the offence for which the defendant is being prosecuted.
(6) Leave is not to be given for cross-examination by another defendant unless--(a) the evidence that the defendant to be cross-examined has given includes evidence adverse to the defendant seeking leave to cross-examine, and(b) that evidence has been admitted.