If a human service zone or state agency receives an application for assistance, or assistance has been granted, under this chapter, the human service zone, unless otherwise directed or determined by the state agency, promptly shall make an investigation and record of the circumstances of the applicant, or child, or both, in order to ascertain the facts supporting the application or the granting of assistance and shall obtain such other information as may be required by the rules and regulations of the state agency.
N.D.C.C. § 50-09-07