At any time after the issuance of a permit to any person to drive a taxicab, the Board of Commissioners may revoke the permit if the person holding the permit is convicted of a felony; a violation of any federal or state statute relating to the use, possession, or sale of intoxicating liquors; a violation of any federal or state statute relating to the use, possession, or sale of narcotic drugs; a violation of any federal or state statute relating to prostitution; repeated violations of traffic laws; or if the person becomes a habitual user of intoxicating liquors or narcotic drugs.
('70 Code, Ch. I, Art. II § 5)