Tenn. Code Ann. § 8-6-302: Permission for department or agency attorneys to represent state

The attorney general and reporter, exercising discretion and with the concurrence of the head of the executive agency involved, may permit, by express written authorization, staff attorneys employed by the various departments, agencies, boards, commissions or instrumentalities of the state to appear and represent the state in a certain case or certain classes of cases under the direction and control of the attorney general and reporter.