Tenn. Code Ann. § 2-19-136: Grand jury witness immunity

When any person, without such person's contrivance or procurement, is sent as a witness before the grand jury and is examined before them touching offenses under this chapter, no person against whom such person's evidence is given can afterwards be used as a witness against the person when on trial for an offense under this chapter committed previous to the person's being examined as a witness as aforementioned.