Improper questions s41
(1)    The court may disallow a question put to a witness in cross-examination, or inform the witness that it need not be answered, if the question is: (a) Misleading; or (b)Unduly annoying, harassing, repetitive, intimidating, offensive or oppressive.
(2)    Without limiting the matters that the court is to take into account for the purposes of (1), the court is to consider:
(a) any relevant condition or characteristic of the witness including age, personality and education; and (b)any mental, intellectual or physical disability to which the witness is or appears to be subject.

-    Leading Questions
•    Definition: A leading question is one which directly or indirectly suggests a particular answer to the question OR one which assumes the existence of a fact, the existence of which is in dispute and the witness has not yet given evidence on that.

Picker v The Queen

GPI Leisure Corp Ltd v Herdman Investments (1990)
•    Held: A question asked by counsel in chief is objectionable as leading when it suggests the answer, not when it merely directs the attention of the witness to the subject in respect of which he is questioned.

NMFM Property and Others v Citibank Ltd (1999)

Leading questions (Cross-examination) s42
(1)    A party may put a leading question to a witness in cross-examination unless the court disallows the question or directs the witness not to answer it.
(2) Without limiting the matters that the court may take into account in deciding whether to disallow the question or give such a direction, it is to take into account the extent to which: (a) evidence that has been given by the witness in examination in chief is unfavourable to the party who called the witness; and (b) the witness has an interest consistent with an interest of the cross-examiner; and (c)the witness is sympathetic to the party conducting the cross examination either generally or about a particular matter; and (d) the witness’s age or any mental intellectual or physical disability, to which the witness is subject, may affect the witness’s answers.                                    
(3)    The court is to disallow the question, or direct the witness not to answer it, if the court is satisfied that the facts concerned would be better ascertained if leading questions were not used.
(4)    This section does not limit the court’s power to control leading questions.
 
•    Section 27 of the Evidence Act preserves the right to question a witness called by the other party to a case.

(b) Cross Examination on Documents

•    Where the witness has written a prior inconsistent statement a cross-examiner can use a document to cross-examine that witness

-    Prior Inconsistent Statements
1.    'prior inconsistent statement': a previous representation that is inconsistent with evidence given by the witness;
2.    'previous representation': is a representation made otherwise than in the course of giving evidence in the proceeding in which evidence of the representation is sought to be adduced.

TEST: At common law the test of prior inconsistent statement is whether the statement is capable of being regarded as inconsistent with evidence given by the same witness. There is no requirement in section 43 that the prior statement be relative to the subject matter of the proceedings.

•    To be admissible the evidence of the prior inconsistent statement must be relevant (s56)  presumably, it will always be relevant because it relates to the credibility of the witness (s55(2)(a)).

•    Once admitted, it may be used as evidence of what was asserted in it (s60) as well as to discredit the witness. Where the statement is relevant only to the witness's credibility, the credibility rule (s102) must be satisfied. It, among other things, prevents evidence of the statement being adduced otherwise than from the witness unless (s106) 'the witness has denied the substance of the evidence'.