540 CMR 9.00 is adopted by the Registrar of Motor Vehicles pursuant to M.G.L. c. 90, § 31,

1. c. 6C, § 56 and c. 30A, § 9 to establish standards and procedures to be followed by the Registrar in discretionary hearings involving the suspension, revocation or reinstatement of any license, registration, certificate, or privilege issued or allowed under M.G.L. c. 90 or c. 90D. Nothing in 540 CMR 9.00 should be construed to vary, change or abrogate the existing statutory law governing the action of the Registrar of Motor Vehicles or his or her duly authorized agents.