Pub. L. 85-584, tit. III, sec. 305

Sec. 305. Whenever any officer or member of the Metropolitan Police force, the Fire Department of the District of Columbia, the White House Police force, or the United States Park Police force is changed or demoted from any class to a lower class, the Commissioners of the District of Columbia, or the Secretary of the Treasury, or the Secretary of the Interior, as the case may be, may, in their or his discretion, in changing or demoting such officer or member, fix his rate of compensation at any rate provided for the Class or Sub-Class to which he is changed or demoted which does not exceed his existing rate of compensation, except that if his existing rate falls between two step rates provided in such lower class, he may receive the higher of such rates.