Tenn. Code Ann. § 29-38-110: Joinder

(a) Two (2) or more persons may join in one (1) action under this chapter as plaintiffs, if their respective actions have at least one (1) place of illegal drug activity in common, and if any portion of the period of illegal drug use overlaps with the period of illegal drug use for every other plaintiff.

(b) Two (2) or more persons may be joined in one (1) action under this chapter as defendants, if those persons are liable to at least one (1) plaintiff.

(c) A plaintiff need not be interested in obtaining, and a defendant need not be interested in defending against, all the relief demanded. Judgment may be given for one (1) or more plaintiffs, according to their respective rights to relief, and against one (1) or more defendants, according to their respective liabilities.