Mental Illness - As introduced, establishes a rebuttable presumption that a person poses an imminent substantial likelihood of serious harm and needs emergency detention and examination if the person was charged with one of certain criminal offenses and ordered by the criminal, circuit, or general sessions court to undergo an evaluation to determine whether the person is incompetent to stand trial or the person's mental capacity at the time of the commission of the crime; requires clear and convincing evidence to rebut the presumption. - Amends TCA Title 33; Title 40 and Title 52.