discussed Cited "see" Babcock v. State See Robinson v. Tennessee, 340 F.Supp. 82, 85 (E.D.Tenn.1972), aff'd, 474 F.2d 1273 (6th Cir.1973), cert. denied sub nom., 414 U.S. 848 , 94 S.Ct. 137 , 38 L.Ed.2d 96 (1973) (while no constitutional issue is presented by admission of testimony given by a witness who remained in the courtroom in violation of the rule, exclusion of such a witness’s testimony could raise a constitutional issue).