Miss. Code Ann. § 43-9-13

Whenever a county welfare agent receives an application for assistance under this chapter, an investigation and record shall promptly be made of the circumstances of the applicant to ascertain the facts supporting the application made under this chapter and such other information as may be required by the rules of the state board.

The county department and the state department shall have the power to conduct examinations, subpoena witnesses, require the attendance of witnesses, and the production of books, records and papers, and make application to the circuit court of the county to compel the attendance of witnesses and the production of such books, records and papers. The county board and such officers and employees as are designated by the state commissioner may also administer oaths and affirmations.