Except when acting pursuant to M.G.L. c. 90, § 22(a) or when acting pursuant to a mandatory statute, the Registrar shall not take adverse action without first affording the applicant notice and an opportunity for a hearing. When the Registrar takes adverse action without a hearing under M.G.L. c. 90, § 22(a) he or she shall thereafter give notice and an opportunity for a hearing according to the provisions of such section.
540 CMR, § 9.04