D.C. Mun. Regs. tit. 18, r. 18-902
The Director may refuse to issue or renew, or may suspend or revoke a license issued under the provisions of §§ 900 and 901 in any case where the Director finds the applicant or licensee has violated or failed to comply with any of the provisions of §§ 900 and 901, or whenever the Director finds that the person to whom it was issued is no longer physically, mentally, or morally qualified to hold such license.
Upon suspending, revoking, or refusing to issue or renew a license, the Director shall immediately notify the applicant or licensee, stating the reasons for the action and affording a reasonable opportunity for hearing.
Service of any order of suspension or revocation shall be by registered mail, return receipt requested, to the last known address of the licensee on file in the Department.
If such notice is returned for reasons other than refusal, then the order shall be referred to the Chief of Police, Metropolitan Police Department, for personal service by a member of that department.
Any order of suspension or revocation shall be effective on the date it is mailed by registered mail, return receipt requested, to the last known address of the licensee on file with the Department; Provided, that if the notice is returned for reasons other than refusal, the effective date of the notice shall be the date on which personal service is made on the licensee or his or her attorney.
A suspended or revoked license shall be returned immediately to the Director by the licensee.
An Appeals Board shall review an order suspending or revoking a license if the licensee files a written request stating the reasons for the requested review within five (5) days of the effective date of the order of suspension or revocation.
An examiner shall review a refusal to issue a license if the applicant files a written request stating the reasons for the requested review within five (5) days of the refusal to issue a license.
D.C. Mun. Regs. tit. 18, r. 18-902