It is unlawful for any person to practice or offer to practice environmental health science and public health sanitation in this state without being licensed, certified or permitted under the provisions of this article, or to advertise or use any title or description tending to convey the impression that the person is a registered sanitarian, sanitarian or sanitarian-in-training unless he or she has been duly authorized under the provisions of this article, and the license, certification or permit has not expired or been suspended or revoked.