"Agent" means all agents of the Kansas bureau of investigation, including the director thereof if the director was a member of the Kansas police and firemen's retirement system at the time of appointment to the office of director, but shall not include any other administrative officers or employees of the Kansas bureau of investigation. Wherever the word "policeman" is used in K.S.A. 74-4951 et seq., it shall be construed to include the word agent as defined herein.
K.S.A. 74-4980