Mo. Rev. Stat. § 205.840: Board of police commissioners to aid social welfare board (second class counties).

It shall be the duty of the board of police commissioners of said cities, and the health officers of said cities and counties to render said social welfare board, its officers and agents, such aid as may be requested by them, or either of them, whenever such aid requested shall reasonably come within the duties of said police board, its agents or officers or the health officers aforesaid.