"In criminal proceedings, evidence of the bad character of a person other than the defendant is admissible if and only if- "(a) it is important explanatory evidence, "(b) it has substantial probative value in relation to a matter which- "(i) is a matter in issue in the proceedings, and "(ii)is of substantial importance in the context of the case as a whole, or "(c) all parties to the proceedings agree to the evidence being admissible."
"Does the witness have previous convictions for any criminal offence?"
"Has the witness ever been investigated for or charged with an offence which did not result in a conviction? "3. Has the witness ever been the subject of a disciplinary investigation or hearing (regardless of the outcome)? "4. Has the witness ever given evidence in any proceedings (criminal, civil or otherwise) which has been demonstrated to be the untrue? "5. Has the witness ever given information to the police or any other investigating authority which has been shown to be false? "6. Are there any other matters which are evidence or past acts of, or which show a propensity towards, the following: "i) Dishonesty? "ii) Other misconduct or reprehensible behaviour."
"It is not therefore appropriate to suggest that, apart from convictions, this area of credibility and reliability is not addressed by the investigating authorities."
"The defence were entitled to be given information in the possession of the prosecution which has any relevance, or possible relevance, or realistically may lead to evidence which may undermine the prosecution case against the defendant or provide support for the defendant's case. This arises whether the defence make specific disclosure or not. A justified claim that material in the possession of the prosecution is relevant in the sense explained in the authorities must be distinguished from a forensically manufactured opportunity for a general trawl through the prosecution papers with the risk that the burden imposed on the prosecution will defeat the interests of justice by causing a discontinuance of the case whereas it would otherwise proceed."
"When does a duty--"
"... arise requiring the prosecution to enquire into or to investigate the bad character of a prosecution witness?"