Tennessee Code Title 68. Health, Safety and Environmental Protection § 68-115-404

(a) In making round and foul determinations, the referee shall be the sole arbiter of the professional contest; however, the ringside physician shall advise the referee to terminate or continue the contest based on the physician's observation of the combatant's physical condition.

(b) Immediately following the professional contest, the ringside physician shall examine both combatants.

(c) After examining each professional combatant who has lost as a result of a technical knockout (TKO) or knockout (KO), the ringside physician may require the combatant to undergo a neurological examination.

(d) If a loss of consciousness has occurred, the professional combatant may undergo neurological testing at the determination of the commission and may not be permitted to participate in any professional contest until the test has been conducted and the combatant has been determined to be medically fit to compete by a neurologist. All neurological reports shall be submitted to the commission by the neurologist for its review before the combatant may be permitted to compete in a subsequent professional contest.

(e) The commission may require a drug screen or any other examination to be performed or requested immediately following a contest.

(g) All expenses incurred pursuant to this section shall be paid by the promoter.