The Commissioner of Emergency Services and Public Protection may appoint one or more persons to act as special policemen in the Department of Emergency Services and Public Protection, for the purpose of investigating public assistance fraud relating to the beneficiaries of public assistance in this state. Such appointees, having been sworn, shall serve at the pleasure of the Commissioner of Emergency Services and Public Protection and, during such tenure, shall have all the powers conferred on state policemen. They shall, in addition to their duties concerning public assistance cases, be subject to the call of the Commissioner of Emergency Services and Public Protection for such emergency service as he may prescribe.