Whenever the board of county commissioners, in any county having within its borders a municipal corporation of the first class, deems it necessary and advisable for the best interests of the county, for the protection of health or the promotion of morals and order within the county, to employ one or more persons to act as welfare workers in the distribution of funds or supplies to needy poor within the county, derived from any source, such board of county commissioners shall be empowered to employ such welfare workers.
SDCL 28-13-22