Tennessee Code Title 40. Criminal Procedure § 40-11-123

(a) Each of the sureties shall be worth the amount expressed in the undertaking, subject to the execution; but the court, magistrate or officer in taking bail may allow more than two (2) sureties to justify severally in amounts less than that expressed in the undertaking, if the whole qualification is equivalent to two (2) sufficient sureties.

(b) The district attorney general, or the court, magistrate or officer, may examine the sureties on oath touching their sufficiency, in any manner that the district attorney general, or the court, magistrate or officer may deem proper. The court or magistrate may also receive other testimony, either for or against the sufficiency of sureties.