Any person who shall stand charged with an offense cognizable by the council or any committee thereof or the disciplinary hearing commission or any committee thereof shall have the right to invoke and have exercised in his favor the powers of the council or any committee, in respect of compulsory process for witnesses and for the production of books, papers, and other writings and documents, and shall also have the right to be represented by counsel. (1933, c. 210, s. 13; 1959, c. 1282, s. 2; 1975, c. 582, s. 8.)