Tennessee Code Title 40. Criminal Procedure § 40-35-322

(1) “Biological evidence” is any identifiable biological material that was collected as part of a criminal investigation or that may reasonably be used to incriminate or exculpate a person charged with a criminal offense;

(2) “Biological evidence” includes the contents of a sexual assault examination kit or any item that contains blood, semen, hair, saliva, skin tissue, fingernail scrapings, bone, bodily fluids, or other identifiable biological material, and applies whether the material is catalogued separately or is present on other evidence collected; and

(3) “Biological evidence” does not include perishable liquid or tissue specimens collected for toxicological analysis.

(1) By the investigating law enforcement agency or agencies for biological evidence that was collected for the case but never introduced at a trial; and

(2) By the clerk of the court in which any biological evidence was introduced at the defendant's trial.

(1) All applicable biological evidence that is collected on or after April 27, 2016; and

(2) All applicable biological evidence that was collected prior to April 27, 2016, and is in the custody of, and being preserved by, a court clerk or law enforcement agency or agencies.