defendant could not be held accountable based on a prior expression of an intent to escape. The instruction was likewise erroneous on this basis.
Here, as is too often the case, courts of review must ponder over the results of overzealousness in prosecution which frequently fails in its objective and results in overkill that forces the review court to consider setting aside what may otherwise be a fair and just result. Clearly the instruction should not have been used. Nevertheless, not every error in the instructions given warrants reversal of the cause. Reversal is inappropriate unless it is demonstrated that the defendant was so prejudiced by the instruction as to affect the outcome of the verdict. (People v. Kurzydlo (1974), 23 Ill. App. 3d 791, 320 N.E.2d 80.) In reviewing the evidence, we note that defendant’s own expert witness, Dr. Pugh, testified that it was very unlikely (5 to 10 percent chance) that the defendant would have suffered acute brain syndrome to the degree sufficient to impair his reason. In addition, the jailer, Roderick, stated that, during the course of his periodic checks of the inmates, he noticed nothing unusual with respect to the defendant’s actions. Finally, we deem the defendant’s response in giving Officer Ennis a false name and immediately thereafter fleeing from his presence further supportive of the State’s case.
The instruction, aside from those portions we have found objectionable, adequately, although lengthily, described the defense of voluntary intoxication. In view of this, and based on the strong evidence contrary to the defendant’s testimony, we believe the instruction, as given, could not have affected the jury’s verdict. Thus, the error resulting from the improper portion of the instruction was merely harmless.
Defendant secondly contends that his conviction should be overturned because of the admission into evidence of his prior conviction for escape. Relying on People v. Montgomery (1971), 47 Ill. 2d 510, 268 N.E.2d 695, defendant maintains that the prejudicial effect of that particular conviction outweighed its probative value concerning his credibility.
Without considering the validity of the Montgomery argument as it relates to the prior escape conviction, we find the defendant’s position on this issue untenable. During direct examination, defense counsel elicited testimony by the defendant that he had been convicted of burglary, aggravated battery, and escape, and that he had pleaded guilty to each of these charges. Although the State, during its case in chief, introduced a stipulaton reciting that the defendant had a previous felony conviction, it was admitted simply to establish an element of the crime charged, i.e., that the defendant had been convicted of a felony at the time of his escape. (See Ill. Rev. Stat. 1975, ch. 38, par. 31 — 6(a).) It is well established that a defendant cannot on review object to testimony which