(a) ascertain what constitutes the best tests for determining whether
life is extinct, and shall prescribe the application of such tests, as
he may deem necessary;
(b) investigate all alleged violations of law and of all rules and
regulations relating to funeral directing, undertaking, and embalming;
(c) appoint such personnel as he may deem necessary, who, subject to
the supervision, direction, and control of the commissioner, shall
exercise the powers and perform the duties of the department and advise
the commissioner under this article.