In disciplinary proceedings where the complaint requires inquiry into the conduct underlying a conviction (such as a 'not of good character' complaint), the practitioner must be permitted to lead evidence challenging the facts of that conduct, even if inconsistent with the conviction. The public policy against collateral attack on convictions is not engaged where the purpose is to respond to a conduct-based complaint rather than to impugn the conviction itself. Statutory provisions facilitating proof of convictions and transcripts do not make them conclusive evidence of the underlying facts in such proceedings.
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