The board shall have authority to establish a code of conduct and of ethics, to administer oaths, to summon witnesses, and to take testimony in all matters relating to its duties. The board shall issue licenses to practice psychology to all persons who shall present satisfactory evidence of attainments and qualifications under this chapter and the rules and regulations of the board. Such licenses shall be attested by the division director under the board's adopted seal, and it shall give absolute authority to the person to whom it is issued to practice psychology in this state. It shall be the duty of the division director, under the direction of the board, to aid the prosecuting attorneys in the enforcement of this chapter and the prosecution of all persons charged with the violation of its provisions.