The said Mayor and City Council of Baltimore is hereby empowered at any and all times during the progress of the work herein authorized and any and all parts thereof, at its own expense, to maintain an efficient police service for the purpose of preserving the public peace, protecting property and preventing crime within the territory occupied or used by it or its employees in the prosecution of said work, or by the employees of contractors or subcontractors engaged on such work; the officers so employed by said City to have the power to make arrests of persons offending within such territory, wherever found within the State; such offenders shall be tried in the county in which the offense may be committed, and in the event of conviction and imposition of a jail sentence, whether by the Circuit Court for such county, or by the District Court thereof, shall be committed to the Baltimore City Jail instead of to the county jail; and, in all such cases, the Mayor and City Council of Baltimore shall reimburse the county in which such offense is committed for all costs and expenses actually incurred by it, including the sum of eighty-five cents per day for every person committed for trial to the jail of such county, in proceedings against, and the trial and commitment of, such offenders, court costs to be prorated by the Clerk of the Circuit Court for such county upon the basis of time actually consumed in such trials or other proceedings; all such costs to be adjusted and paid semi-annually. Said police service as to any county affected by the provisions of this subheading shall be subject to the supervision and direction of the marshal or chief of the police force of such county. P.L.L., 1949, §661 1969, §25-34 1931, ch. 521 1979, ch. 125