The Mayor of the District of Columbia is also hereby authorized and empowered to create one or more trial board or boards, to be composed of such number of persons as said Mayor may appoint thereto, for the trial of officers and members of said police force; and the Council of the District of Columbia is hereby authorized and empowered to make and amend rules of procedure before such trial board or boards as it deems proper and the Mayor is hereby authorized and empowered to change or abolish any such trial board or boards as he may deem proper; and the findings of such trial board or boards shall be final and conclusive unless appeal in writing therefrom is made within 5 days to the Mayor of the District of Columbia, the hearings on appeal to be submitted either orally or in writing, and the decision of the said Mayor thereon shall be final and conclusive; provided, that said Mayor shall not be required, in his review of the sentences and findings of such trial board or boards, to take evidence, either oral, written, or documentary, and he shall have power to reduce or modify the findings and penalty of the trial board or boards or remand any case against any officer or member of said police force to such board or boards for such further proceedings as he may deem necessary; provided, that the chairman for the time being of any and every trial board be, and he is hereby, authorized to administer oaths to and take affirmations of witnesses before such board or boards; and provided, that the rules and regulations of said Metropolitan Police force promulgated and in force on July 8, 1906, are hereby ratified and shall remain in force until changed, altered, amended, or abolished by said Council.
