The commissioner, with the approval of the board, is authorized to divide the state into districts or divisions as may be necessary for the purpose of effectually patrolling the public roads and highways of the state and of the counties thereof and for combating, detecting, and preventing crime.
(Ga. L. 1937, p. 322, art. 2, § 11; Ga. L. 1946, p. 39, § 3.)