Mr. Justice Frankfurter
delivered the opinion of the Court.
This case was brought here under § 1254 (1) of Title 28 of the United States Code to review the dismissal by the Court of Appeals for the District of Columbia of an appeal from the denial of a motion for a new trial on the ground of evidence discovered after the petitioner had been convicted of murder in the first degree. 335 U. S. 866. The decisive issue is the admissibility of that evidence. The question arises not through its exclusion at trial but on a motion for a new trial in order to be able to introduce it as newly discovered.
The petitioner, Baxter Griffin, was convicted of the murder of Lee Hunter. The killing was the outcome of a quarrel. Admitting that he shot Hunter, Griffin claimed that he did so in self-defense. His story was that the deceased and he were playing a card game called blackjack, that Hunter demanded a larger share of the pot than was his right, and that upon his refusal to pay, Hunter “jumped up and started around the table, with his hand in his pocket, and told me he would kick my teeth out of my head.” On cross-examination Griffin added that Hunter threatened to kill him. Accordingly, so his story continued, Griffin shot Hunter as Hunter advanced toward him with his hand in his pocket. This version of the occurrence was contradicted by five Government witnesses. Each testified that petitioner started the argument, and that it had nothing to do with the card game which, according to their account, was over before the fracas began. According to them, this is what happened: Griffin made some remark to Hunter about taking Hunter’s wife and baby around to Griffin’s house; Hunter replied that he would kick petitioner’s teeth down his throat; Griffin thereupon left the house and returned within ten minutes with a gun, and on his return shot Hunter, who had made no move from the spot where he was standing. Griffin admitted that he saw nothing in Hunter’s hand at the time he shot Hunter. On the evidence, as summarized, the jury on March 28, 1947, found Griffin guilty of murder in the first degree; on April 18, 1947, he was sentenced to death; on December 8, 1947, the conviction was affirmed, 83 U. S. App. D. C. 20, 164 F. 2d 903; on March 15, 1948, this Court denied certiorari, 333 U. S. 857.
On May 7, 1948, a little more than a month before the day set for execution, Griffin began the present proceedings for a new trial. It was based on affidavits of his then counsel who averred that it had recently come to his knowledge that the attendant at the morgue had found an opened penknife in the trousers’ pocket of the deceased and that the prosecutor knew of this at the time of the trial but failed to introduce this circumstance in evidence or make it available to the defense. The affidavits further alleged that there was evidence that playing cards were on the floor immediately after the shooting, a fact which would, had it been known to the defense, have tended to corroborate Griffin’s statement that the card game was in progress at the time of the shooting. An extended hearing was had on the motion for a new trial. The allegation regarding scattered playing cards on the floor at the time of the fatal shooting was adequately met, and this ground for a new trial need not detain us.
As to Griffin’s discovery, after his conviction was affirmed, of the undisclosed knife in the pocket of the deceased, the Government conceded that it knew of this circumstance at the time of the trial and despite that knowledge neither introduced the fact in evidence nor felt any duty to make it known to the defense. The Government justified this on the ground that in its view the circumstance of the knife was inadmissible, since knowledge of its presence in the pocket of the deceased had not been communicated to Griffin either by sight or otherwise. The District Judge took this view of the law and denied the motion for a new trial. In an unreported opinion, he stated, “The question whether a person is justified in attacking an assailant in self-defense must be determined by the facts which were presented to the person who pleads self-defense. He [Griffin] did not know, it appears, that the deceased had an open knife in his pocket, and therefore its existence is irrelevant.” An appeal having been taken, the Government moved to dismiss the appeal on the ground that “the issues raised by appellant’s motion for a new trial were fully explored in the court below and that the disposition made of them by the trial court was manifestly correct.” The appeal was dismissed by a unanimous Court of Appeals, presided over by a judge than whom no one is more alert in protecting the rights of the accused.
Unfortunately, the Court of Appeals evidently thought that the ground for dismissing the appeal was too clear to require explication. It dismissed the appeal without an expression of views regarding the admissibility of the evidence on which the claim for a new trial rests. It may well have done so on the ground that in the District evidence of this nature is inadmissible. That this was the reason for the dismissal is the view of some members of this Court. The opinion of the Court of Appeals on a later appeal from the denial of a petition for habeas corpus by Griffin lends support to such an interpretation of the summary dismissal of the appeal now under review'. See Griffin v. Clemmer, 83 U. S. App. D. C. 351, 169 F. 2d 961. But solicitude for life bars reliance on such an inference, especially since the issue on habeas corpus is quite different from that on appeal from a denial of a motion for a new trial. It seems to us more appropriate for the Court of Appeals to address itself directly to the issue of admissibility. This is so in order to rule out the inference that the Court of Appeals may, in applying United States v. Johnson, 327 U. S. 106, have deemed the denial of a motion for a new trial on the basis of newly discovered evidence solely a matter for the trial court’s discretion.
Were the Court of Appeals to declare that the controverted evidence was admissible according to the law prevailing in the District, it would have to consider further whether it would not be too dogmatic, on the basis of mere speculation, for any court to conclude that the jury would not have attached significance to the evidence favorable to the defendant had the evidence been before it. If the Court of Appeals had decided that the disputed evidence was not admissible in the District of Columbia on a claim of self-defense and on that ground had sustained the denial of the motion for a new trial, there would have been an end of the matter. It is not to be assumed that this Court would have granted a petition for certiorari to review the ruling since the determination would have been a matter of local law as are the rules of evidence prevailing in the State courts.
We are told, however, that a ruling which did not permit the introduction of “uncommunicated threats” would constitute “egregious error” to be corrected by this Court. Fisher v. United States, 328 U. S. 463, 476. Wig-more is vouched as authority that uncommunicated threats are admissible in “virtually all Courts.” But Wigmore immediately follows the words quoted with a series of qualifications and limitations which prove that there are few questions of admissibility in trials for murder that have occasioned a greater contrariety of views. See 1 Wigmore, Evidence § 111 (3d ed., 1940). By way of example, most jurisdictions hold that evidence of uncommunicated threats is inadmissible where there is clear proof that the defendant took the initiative, or where there is no evidence that the deceased was the aggressor other than the proffered uncommunicated threats. Were this the rule in the District, the dismissal of the appeal may well have been rested on it, since there was weighty proof that the petitioner was the aggressor. Indeed, for all we know the Court of Appeals might have had in mind a rule concerning uncommunicated threats that would admit them and yet guard against the danger of fabrication by placing upon the trial judge the responsibility of excluding such alleged threats against the defendant in the absence of proof satisfactory to him of some hostile manifestation by the deceased relevant to the killing. At least one State has some such rule. State v. Carter, 197 La. 155, 158, 1 So. 2d 62, 63. This is not to reject as unreasonable a rule, followed by some courts, that would let the evidence in, even where all other witnesses oppose a defendant’s version of the killing.
One thing is clear. There is no “federal rule” on this subject. The decision in Wiggins v. Utah, 93 U. S. 465, does not purport to lay down a general rule, nor does it even formulate the evidentiary problem now in controversy. In that case, in light of the fact that there was no other identification of the aggressor, proof was offered that the deceased had exhibited a pistol a few minutes before the shooting and had said, though out of the hearing of the accused, that “he would kill defendant before he went to bed that night,” and this Court naturally held that this evidence should have been admitted. It did so because “it would have tended strongly to show where that first shot came from, and how that pistol, with one chamber emptied, came to be found on the ground.” Wiggins v. Utah, supra at 470.
But even assuming that the “federal rule” is that the evidence described in the motion for a new trial would be admissible, it does not follow that it must also be the rule for the District of Columbia. This Court, in its decisions, and Congress, in its enactment of statutes, have often recognized the appropriateness of one rule for the District and another for other jurisdictions so far as they are subject to federal law. Thus, the “federal rule” in first-degree murder cases is that, unless the jury by unanimous vote agrees that the penalty should be death, the court must fix the sentence at imprisonment for life. 35 Stat. 1151, 1152, 18 U. S. C. § 567, now 18 U. S. C. § 1111 (1948), Andres v. United States, 333 U. S. 740. But a defendant convicted of first-degree murder in the District cannot look to the jury to soften the penalty; he must be given the death sentence. 31 Stat. 1321, 43 Stat. 799, D. C. Code § 22-2404, Johnson v. United States, 225 U. S. 405. Furthermore, the Court’s decision in Fisher v. United States, 328 U. S. 463, makes clear that when we refused to reverse the Court of Appeals for the District we were not establishing any “federal rule” in interpreting the murder statutes which apply in places other than the District of Columbia over which Congress has jurisdiction. In fact, this Court has been at pains to point out that “Congress . . . recognized the expediency of separate provisions” pertaining to criminal justice applicable exclusively to the District of Columbia in contradistinction to the Criminal Code governing offenses amenable to federal jurisdiction elsewhere. Johnson v. United States, 225 U. S. 405, 418.
Many statutes reflect this distinctive position of the District in matters of criminal law. Compare 35 Stat. 1149, 18 U. S. C. § 516 (“federal” adultery statute), now repealed, 18 U. S. C. p. 2415 (1948), with 31 Stat. 1332, D. C. Code § 22-301 (District adultery statute); compare 35 Stat. 1143, 18 U. S. C. §§ 2031, 2032 (1948) (“federal” rape statute) with 31 Stat. 1322, 41 Stat. 567, 43 Stat. 798, D. C. Code § 22-2801 (District rape statute); compare 35 Stat. 1144, 18 U. S. C. § 2111 (1948) (“federal” robbery statute) with 31 Stat. 1322, D. C. Code § 22-2901 (District robbery statute); compare 35 Stat. 1144, 18 U. S. C. § 466 (“federal” larceny statute), now repealed, 18 U. S. C. p. 2415 (1948), with 31 Stat. 1324, D. C. Code § 22-2201 (District larceny statute). In fact, it requires two volumes to contain “all the general and permanent laws relating to or in force in the District of Columbia, on January 3, 1941, except such laws as are of application in the District of Columbia by reason of being laws of the United States general and permanent in their nature.” See Preface to District of Columbia Code (1940 ed.). If Congress can enact substantive rules of criminal law exclusively for the District of Columbia, the Court of Appeals for the District of Columbia ought not to be denied opportunity to formulate rules of evidence appropriate for the District, so long as the rules chosen do not offend statutory or constitutional limitations.
The position of spouses as witnesses strikingly illustrates that the District stands apart from the rule of evidence prevailing generally in the federal courts. The federal courts have held that one spouse cannot testify against the other unless the defendant spouse waives the privilege. Miles v. United States, 103 U. S. 304; Bassett v. United States, 137 U. S. 496; cf. United States v. Mitchell, 137 F. 2d 1006, 1008 (C. A. 2d Cir.). Since this Court in the Funk case left open the question whether this rule should be changed, Funk v. United States, 290 U. S. 371, 373, it presumably is still the “federal rule” for the lower courts. In the District, however, the rule has long been otherwise. Halback v. Hill, 49 App. D. C. 127, 261 F. 1007; Buford v. Buford, 81 U. S. App. D. C. 169, 170, 156 F. 2d 567, 568; cf. Dobbins v. United States, 81 U. S. App. D. C. 218, 157 F. 2d 257; 31 Stat. 1358, D. C. Code § 14-306. Another example is afforded by the fact that the statute just cited also provided that one spouse could testify in favor of the other in cases in the District when the “federal rule” was still to the contrary. Compare Jin Fuey Moy v. United States, 254 U. S. 189; Hendrix v. United States, 219 U. S. 79, both overruled in Funk v. United States, supra.
The problem of the admissibility of the evidence set forth in the motion for a new trial is serious and its wise solution full of difficulty. The problem was apparently not explored below, and at the bar of this Court counsel did not give it the consideration appropriate for determination of a federal issue of general importance. It was not even argued in their briefs. Under such circumstances it is not for us to announce a rule for the District of Columbia. Nothing that has been said concerning the various possible choices is intended as an expression of preference among the competing rules about the admissibility of uncommunicated threats, nor as the slightest restriction upon the freedom of the Court of Appeals to make its own choice. We purposely withhold any expression of opinion on the merits of any of the permissible views on admissibility of this evidence. Certainly nothing in our decisions forecloses the Court of Appeals from selecting any one in the range of choices open to it, each one having some rational basis. That court has heretofore been recognized as the appellate tribunal for determining the local rules of evidence; it also is a court that has active experience with the just and practical considerations governing trials for murder, plainly outside the preoccupation of this Court.
It is precisely for such reasons that for a decade the Court has declined to review all convictions for first-degree murder in the District of Columbia, with a single exception, and in every one of these cases some local rule of evidence was at least in part involved. The Appendix, infra, p. 719, gives a summary of the legal issues involved in the fourteen cases in which we denied a petition for certiorari. This course of disposition manifests uniformity of respect by this Court for District rulings on evidence. Reference to this course of disposition of attempts to secure review here for convictions of mürder in the District in no wise disregards our repeated admonition that denial of a petition for certiorari imports nothing as to the merits of a lower court decision. These denials do not remotely imply approval of the various rulings on evidence made in these cases by the Court of Appeals for the District. What they do establish is that it has become settled practice for this Court to recognize that the formulation of rules of evidence for the District of Columbia is a matter purely of local law to be determined — in the absence of specific Congressional legislation — by the highest appellate court for the District.
Previous to this case, there was, as has been noted, a single exception to this Court’s consistent refusal, for the past decade, to bring here for review a conviction for murder in the District. The disposition of the exception powerfully underlines the significance of the necessity for the Court of Appeals to pass initially on this issue. The conviction in that case was affirmed essentially on the principle that the law of evidence and procedure governing criminal trials in the District of Columbia is in the keeping of the Court of Appeals for the District and is not to be exercised by this Court. “The administration of criminal law in matters not affected by constitutional limitations or a general federal law is a matter peculiarly of local concern. . . . Matters relating to law enforcement in the District are entrusted to the courts of the District. Our policy is not to interfere with the local rules of law which they fashion, save in exceptional situations where egregious error has been committed.” Such were the views which determined decision in Fisher v. United States, 328 U. S. 463, 476. While the Fisher case evoked dissent, it was a decision rendered after the Court of Appeals had fully declared its views of the law, and none of the considerations that moved the dissenters in that case is even remotely present in the case now before us.
We must therefore remand the case to the Court of Appeals with instructions to decide, in the first instance, what rule should prevail in the District of Columbia. To do otherwise would constitute an unwarranted departure from a wise rule of practice in our consideration of cases coming here from the Court of Appeals of the District. “There are cogent reasons why this Court should not undertake to decide questions of local law without the aid of some expression of the views of judges of the local courts who are familiar with the intricacies and trends of local law and practice. We do not ordinarily decide such questions without that aid where they may conveniently be decided in the first instance by the court whose special function it is to resolve questions of the local law of the jurisdiction over which it presides. Huddleston v. Dwyer, 322 U. S. 232, 237, and cases cited. Only in exceptional cases will this Court review a determination of such a question by the Court of Appeals for the District.” Busby v. Electric Utilities Employees Union, 323 U. S. 72, 74-75.
Remanded.
[For dissenting opinion of Mr. Justice Murphy, see post, p. 721.]
APPENDIX TO OPINION OF THE COURT.
Summary of Disposition of Petitions for Certiorari to the Court of Appeals for the District of Columbia to Review Death Sentences on Conviction for First-degree Murder since 1938.
In Griffin v. Clemmer, 83 U. S. App. D. C. 351, 169 F. 2d 961, the Court of Appeals had before it an appeal from the denial of a petition for a writ of habeas corpus alleging that Griffin’s detention was illegal because the conviction was procured by unfair conduct on the part of the prosecutor. This was filed by Griffin after the Court of Appeals had dismissed the appeal from the denial of the motion for a new trial but before this Court granted this petition for certiorari. The claim of unfairness was based on the failure to disclose the finding of the penknife on Hunter. In effect this was a claim of lack of jurisdiction in the court, according to the doctrine of Johnson v. Zerbst, 304 U. S. 458. The Court of Appeals deemed the evidence to be irrelevant to that proceeding. It is too precarious to treat this as a holding on the admissibility of the evidence.
It is pertinent to quote at length Wigmore’s statements on this subject:
“This evidence [uncommunicated threats] is now conceded to be admissible, by virtually all Courts. But the following discriminations must be noted:
“(3) There is much opportunity for abuse of this sort of evidence. Not only may it be manufactured; but, even when genuine, it may be employed improperly to help the defendant by way of justification,— in certain communities at least, where the Courts have been compelled repeatedly to make clear the law that a threat to shoot another is no justification for the latter to kill on sight. For these reasons various limitations have been attempted:
“ (a) The evidence of threat is inadmissible where there is clear evidence that the defendant was the aggressor. Most jurisdictions adopt this rule, and none seem to negative it.
“(b) Furthermore, the threat is only admissible (as most Courts provide) where there is some other evidence of an aggression by the deceased. This is usually expressed by saying that there must have been some ‘demonstration of hostility,’ or, more shortly, some ‘overt act,’ by the deceased. It is difficult to say whether this limitation originated in the “res gesta” notion {infra) or in a rule of criminal law that an overt act is a necessary element of the justification of self-defence, or merely in a general policy of preventing the abuse of this evidence. At any rate, it seems a satisfactory limitation, provided the multiplication of quibbles as to ‘overt acts’ is avoided by leaving the whole matter in the hands of the trial judge; for it prevents the defendant from trying to use the threats as a mere pretext for justifying the killing of one who was making no actual attempt to injure him.
“(c) Another condition, sometimes suggested, but inconsistent with and more stringent than the preceding one, is that the threat should be received only when there is no other direct evidence as to who was the aggressor, i. e. when there were no eye-witnesses. Perhaps in practice a combination of (b) and (c) would be the best; i. e. to admit the evidence when by eye-witnesses there was some other evidence of the deceased’s aggression, or when there were no eye-witnesses to the affair.
“(4) Another and additional use, independent of the preceding, receives the uncommunicated threat in ‘confirmation’ or ‘corroboration’ of communicated threats. This is usually coupled with one of the preceding limitations as an alternative condition of admission.
“(5) The doctrine of “res geste” is sometimes invoked as the ground of receiving the evidence; and the same notion underlies the occasional suggestion that the threats ‘characterize’ the deceased’s conduct. This employment of “res gestee” as a veil for obscurity of thought is elsewhere examined (post, § 1795); and it is enough here to say that it has no possible application to this kind of evidence, and cannot be made to fit its rules; the sooner such phrases are abandoned, the better for clearness of legal thought.
“(6) In some jurisdictions it is impossible to ascertain the exact rule. Previous precedents are ignored, inconsistent tests laid down in succeeding rulings, decisions in other jurisdictions are cited to the exclusion of local precedents; and the oftener the matter comes up for a ruling, the more it is obscured.
“ (7) The prosecution may of course rebut the evidence of threats by counter-testimony of the deceased’s peaceful plans. It would seem also that, whenever the deceased’s aggression is in issue, the prosecution could begin with its evidence of peaceful plans. The prosecution may also, on the principle of § 63, ante, rebut by evidence of the deceased’s peaceful character.
“(8) There may be sundry other cases in which the threats of a deceased person would be relevant apart from the present doctrines.
“ (9) The threats of a third person may also be admitted, where it is desired to show that he, and not the accused, was the aggressor.
“ (10) In other issues in which the aggression of the plaintiff or prosecuting witness is material, his threats are admissible on the foregoing principles.
“ (11) Other conduct of the deceased, not amounting to threats, but indicating a motive to attack (on the principle of § 390, post) may be admitted, by the logic of the present rule, without showing prior communication to the defendant.” 1 Wigmore, Evidence, § 111 (3d ed., 1940).
The repeal of the specific provisions on adultery and larceny does not detract from their illustrative significance.
“. . . There is certainly nothing anomalous in punishing the crime of murder differently in different jurisdictions. It is but the application of legislation to conditions. But if it be anomalous, very little argument can be drawn from it to solve the questions in controversy. The difference existed for a number of years between the District and other places under national jurisdiction, for, as we have seen, the qualified verdict has not existed in the District since the enactment of the District Code, and did not exist when the Criminal Code was enacted. . . .
“Congress certainly in enacting the District Code, recognized the expediency of separate provisions for the District of Columbia. It was said at the bar and not denied that the District Code was not only the work of the lawyers of the District, having in mind the needs of the District, but of its citizens as well, expressed through various organizations and bodies of them. In yielding to the recommendations Congress made no new precedent. It had given local control to the Territories, and it enacted a separate code for Alaska.” Johnson v. United States, 225 U. S. 405, 417-418.
To compare this impressive course of disposition with the fact that we have granted little over 5% of petitions in forma pauperis on behalf of convicts is to treat statistics as though they were merely figures without meaning. The mass of these in forma pauperis petitions, usually drawn by laymen, are pathetically trivial and frivolous endeavors by those incarcerated to procure their freedom after all other hope has faded. To draw inferences from this 5% figure is to treat as fungible denials of certiorari because no federal question is raised, denials because the state remedies were not exhausted, and denials for other unrelated jurisdictional reasons. The fourteen petitions for certiorari for the District of Columbia were of a wholly different nature. They were all cases in which the petitioner was represented by counsel and in which the Court of Appeals for the District of Columbia had considered seriously errors claimed to have occurred in the course of the trial — they were all adjudications on the merits. Our consistent denials under these circumstances are mute evidence, not of approval or disapproval, but of deference to the Court of Appeals for the District of Columbia on rules of evidence prevailing in the District.
The situation in England regarding appeals in criminal cases is not without illumination on the importance of abstention by this Court in criminal cases already decided by two courts. Between the establishment of the Court of Criminal Appeal by the Criminal Appeal Act of 1907 and the end of 1947, there have been 585 appeals in murder cases to that Court. In the same period there have been only four appeals from that Court to the House of Lords. Such appeals can only be taken if “the Director of Public Prosecutions or the prosecutor or defendant obtains the certificate of the Attorney General that the decision of the Court of Criminal Appeal involves a point of law of exceptional public importance, and that it is desirable in the public interest that a further appeal should be brought.” The Criminal Appeal Act, 1907, 7 Edw. VII, c,. 23.
We are indebted for the above figures to the kindness of the Attorney General of England, the Rt. Hon. Sir Hartley Shaweross.