Defendant contends that the trial court erred in refusing to allow testimony regarding his alleged unconscious condition at the time of the accident, in refusing to allow defense counsel to raise the defense of unconsciousness in his closing argument to the jury, and in refusing to instruct the jury as to the defense. We agree and order a new trial.
Unconsciousness is recognized in this State as a complete defense to a criminal charge. State v. Caddell, 287 N.C. 266, 290, 215 S.E. 2d 348, 363 (1975). In the case at bar, defendant attempted to introduce the testimony of Dr. Lawrence McHenry, a neurologist, and Dr. Selwyn Rose, a psychiatrist, both of whom had examined the defendant. On voir dire examination the two doctors testified that there was evidence to suggest that defendant may have sustained a concussion as a result of the fall in Smokey’s Lounge. Although Dr. McHenry would not state that the blow by itself *337would have rendered defendant unconscious, Dr. Rose did in fact testify that, even without the presence of the alcohol, the blow could have caused defendant to become unconscious. On each occasion, the trial court excluded the testimony.
Judge Rousseau stated at trial that he based his decision to exclude the testimony of the two doctors on the fact that voluntary intoxication is not a defense to second degree murder, apparently agreeing with the State that but for defendant’s intoxicated condition, the offense would not have occurred. We find that the court erred in excluding the testimony of Dr. Rose.
To be admissible as substantive evidence, testimony must be relevant and must not be forbidden by some specific rule of law. Freeman v. Ponder, 234 N.C. 294, 304, 67 S.E. 2d 292, 300 (1951). Although we agree that voluntary intoxication is no defense to a criminal charge, we do not find a specific rule of law which would bar testimony that defendant may have sustained a concussion which would have rendered him unconscious even in spite of his intoxication. Therefore, there is no specific rule of evidence which would bar the testimony of Dr. Rose.
On finding that the testimony of Dr. Rose was improperly excluded, it necessarily follows that the court erred in refusing to permit defense counsel to argue the unconsciousness defense to the jury and in refusing to give the jury relevant instructions on unconsciousness.
The question of whether a highly intoxicated defendant can raise the defense of unconsciousness is one which has not been clearly decided in this State. We are aware of State v. Williams, 296 N.C. 693, 252 S.E. 2d 739 (1979), in which Justice Britt stated that “[i]n view of the overwhelming evidence that defendant’s mental state at the time of the commission of the offense in question was brought about by his excessive consumption of intoxicants,” there was no error in refusing to instruct the jury on the defense of unconsciousness. Id. at 701, 252 S.E. 2d at 744.
We also are aware, however, of the case of State v. Smith, 59 N.C. App. 227, 296 S.E. 2d 315 (1982), in which this Court held that where competent evidence in support of an unconsciousness defense is introduced at trial, the Court must instruct the jury as to that defense. In Smith, the Court reasoned that, under G.S. *33815A-1232 (1978), the trial court is required to instruct on all substantial features of the case and that evidence of a complete defense is a substantial feature. Id. at 228-29, 296 S.E. 2d at 316, citing State v. Jones, 300 N.C. 363, 266 S.E. 2d 586 (1980). Significantly, the Court added: “Cognizant of the high potential for abuse inherent in defenses of this sort, we express no opinion as to the weight or credibility properly accorded this evidence; that determination is for the jury.” Id. at 230, 296 S.E. 2d at 317.
In the case at bar, the defense of unconsciousness was not established by the evidence, but the trial court excluded testimony that may have put the defense in issue. Following the reasoning of this Court in State v. Smith, supra, we hold that the trial court committed error in refusing to permit defense counsel to pursue the unconsciousness defense before the jury.
New trial.
Judges WHICHARD and BECTON concur.