In State v. Draughn (1992), 76 Ohio App. 3d 664, 602 N.E.2d 790, this Court stated: "In opening closing argument the prosecutor is limited to comments upon the evidence, and the logical and appropriate conclusions to be drawn therefrom. Thus, he can bolster his own witnesses, and conclude by saying, in effect, 'The evidence supports the conclusion that these witnesses are telling the truth.' He cannot say, 'I believe these witnesses,' because such argument invades the province of the jury, and invites the jury to decide the case based upon the credibility and status of the prosecutor. See State v. Smith (1984), 14 Ohio St. 3d 13, 14 OBR 317, 470 N.E. 2d 883. In a sense, such argument by the prosecutor injects himself into the trial as a thirteenth juror, and claims to himself the first vote in the jury room. Further, it is inappropriate for the prosecutor to vouch for the integrity of his witnesses. Id.