A jury found that Hamp Webb willfully shot a passing helicopter. 18 U.S.C.A. § 32 (West 1969). Webb appeals his conviction, claiming evidentiary error and misconduct by the trial judge. We affirm.
The helicopter pilot, one Moore, testified that he was flying past Webb’s house when he saw Webb run out to a parked car, take out a rifle and commence firing. That *710 was the incident for which Webb was indicted. Moore continued, however, to testify that someone on Webb’s property again shot at him some days after the incident in question. Webb objected to the admission of this subsequent similar act, his first claim of error here.
In
United States v. Beechum,
As it turned out at trial, Webb’s sole defense was an alibi, viz., that he was planting turnips when the shooting incident occurred. We may assume, without deciding, that if Webb had offered so to stipulate in advance of trial,
cf. United States v. Mohel,
Webb also argues that the district court erroneously excluded certain expert testimony that he lacked “propensity to
^
commit a violent act.” Brief for Appellant at 24. The district court apparently considered such testimony, “irrelevant,” reasoning that if Webb’s alibi were believed “it wouldn’t matter whether he was violent or not violent.” Tr. 187.
1
The court further found that the proffered testimony fell
*711
within Fed.R.Crim.P. 12.2(b),
2
and was ex-cludable because Webb had failed to notify the Government of its intended use.
See
Fed.R.Crim.P. 12.2(d). Although we must reject these legal conclusions as “manifestly erroneous,”
Salem v. United States Lines Co.,
Fed.R.Evid. 401 provides that evidence is “relevant” if it has “any tendency to make the existence of any [material] fact . more probable or less probable than it would be [otherwise] . . . .” The excluded testimony would have purported to show, based on psychological tests, that Webb was non-violent and therefore unlikely to shoot at a helicopter. If competent, that evidence clearly would have some tendency to confirm Webb’s alibi, i. e, a peaceable man would more likely be planting turnips than shooting at passing aircraft. Nor can we agree that the proffered testimony fell within Fed.R.Crim.P. 12.2(b). That Rule requires that the Government be notified of testimony “bearing upon the issue of whether [the defendant] had the mental state required for the offense charged.” Patently, the excluded testimony was not of that sort. It was offered to prove that Webb did not commit the offense charged, not that certain conduct was unaccompanied by criminal intent.
Cf. United States v. Busic,
But while we thus disagree with the district court’s grounds for exclusion, we find ample support for its result in the so-called “opinion rule,” see generally 7 J. Wigmore, Evidence §§ 1917-29 (Chadbourne rev.ed. 1978), codified in Fed.R.Evid. 701-06. That rule prohibits the admission of opinion testimony, save where the proponent demonstrates the applicability of some exception. Webb plainly sought to invoke the exception recognized for qualified “experts,” whose opinions are admissible when their “scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue.” Fed.R.Evid. 702. Although it seems, these days, that even the most obvious of phenomena admit of “expert” analysis, the opinion rule does not bend so far.
“The theory upon which expert testimony is excepted from the opinion evidence rule is that such testimony serves to inform the court about affairs not within the full understanding of the average man.”
Farris v. Interstate Circuit, Inc.,
We have considered appellant’s arguments that the trial judge engaged in prejudicial misconduct, and find them without merit.
AFFIRMED.
Notes
. The district court suggested, but did not rule, that the testimony was irrelevant for the additional reason that, as “a personality analysis [and] not a predictor of human behavior,” it lacked substantial probative force. Tr. 190. In light of our holding, we need not pass on this issue.
. Fed.R.Crim.P. 12.2(b) provides, in pertinent part:
If a defendant intends to introduce expert testimony relating to a mental disease, defect, or other condition bearing upon the issue of whether he had the mental state ra-quired for the offense charged, he shall, within the time provided for the filing of pretrial motions or at such later time as the court may direct, notify the attorney for the government in writing of such intention and file a copy of such notice with the clerk.
