Section 436 - Hearings; immunity1. A hearing upon any investigation or review authorized by this article or by article fourteen-h of the general municipal law may be conducted by two or more members of the commission or by a hearing officer duly designated by the commission, as the commission shall determine.2. A person who has violated any provision of this article or article fourteen-h of the general municipal law, or of the rules and regulations of the commission, or any term of any license issued under said articles or said rules and regulations, is a competent witness against another person so charged. In any hearing upon any investigation or review authorized by this article or article fourteen-h of the general municipal law, for or relating to a violation of any provision of said articles or of the rules and regulations of the commission or of the term of any such license, the commission, may confer immunity upon such witness in accordance with the provisions of section 50.20 of the criminal procedure law. Such immunity shall be conferred only upon the vote of at least three members of the commission, and only after affording the attorney general and the appropriate district attorney a reasonable opportunity to be heard with respect to any objections which they or either of them may have to the granting of such immunity.