Tennessee Code Title 12. Public Property, Printing and Contracts § 12-3-504

(a) The chief procurement officer may identify goods or services that may not be procured by competitive means because of the existence of a single source of supply.

(b) The chief procurement officer must submit to the procurement commission for approval rules, policies, and procedures prescribing the manner in which such procurements may be accomplished, which may include noncompetitive negotiation.

(c) Goods or services that may not be procured by competitive means because of the existence of a single source of supply must be purchased in accordance with rules, policies, and procedures approved by the procurement commission.