Opinion
MOSK, J.
This proceeding arises out of a petition for writ of habeas corpus filed in this court by Harry M. Sassounian seeking to vacate a judgment of the Superior Court of Los Angeles County.
I
The judgment under challenge was rendered after jury trial in a capital prosecution that received widespread publicity, within California and without. The subject of the proceeding was the killing of Kemal Arikan, the Consul General of the Republic of Turkey at Los Angeles and a Turkish national, which took place in the Westwood area of that city.
At the guilt phase, there was no substantial dispute that Arikan was the victim of assassination. It was his custom to leave his residence about 9:30 a.m. in a white Ford LTD with consular corps license plates, passing along nearby Comstock Street to its intersection with Wilshire Boulevard, and then on to his office at the Turkish consulate. On Thursday, January 28, 1982, he followed his custom. Around the time he left his residence, two men took up positions at the Wilshire-Comstock intersection, one on the southwest comer and the other on the southeast; they stood very close to the thoroughfare, staring eye to eye across Comstock Street, which had a traffic signal that remained red unless activated by a vehicle detector or a pedestrian cross-button. Not long thereafter, Arikan approached the intersection in his automobile. Straightway, the two men descended on him and his vehicle; the man formerly on the intersection’s southwest comer moved toward the driver side, with a 9-millimeter pistol in one of his hands; the man formerly
on the intersection’s southeast comer moved toward the passenger side, with a .45-caliber pistol apparently in his left hand; they made no attempt whatsoever to seize Arikan or to take any of his possessions; rather, they opened fire at close range and proceeded to empty their magazines, striking Arikan several times in the head and chest; they immediately ran from the scene, tossed away their weapons, and fled in a gray Chevrolet Nova bearing California license plate No. 534 TER. Within minutes, Arikan died of his wounds.
Although there was no substantial dispute that Arikan was the victim of assassination, there
was
substantial dispute whether petitioner was one of his assassins.
The prosecution called various witnesses who told a tale to the following effect. Petitioner is of Armenian heritage. On the date of the Arikan assassination, he was 19 years of age and had lived in the United States about 5 years, having emigrated with his family from Beirut as a result of the Lebanese civil war. Apparently, he was not personally acquainted with Arikan. According to one of his brothers, as recounted by a police officer, he “had bad feelings towards the Turkish people for the things that they had done [to Armenians] in the past,” and he held the view that “Turks are animals." He was identified by eyewitnesses as standing on the southeast comer of the Wilshire-Comstock intersection before the assassination and as fleeing from the scene afterward. One of his friends, Krikor Saliba, who was also of Armenian heritage, was identified by eyewitnesses as standing on the southwest comer of the intersection before the assassination and as fleeing from the scene afterward. Petitioner was the registered owner of the gray Chevrolet Nova bearing California license plate No. 534 TER, which was used for flight, and did not allow anyone else to drive the vehicle. On his arrest within hours of the assassination, he bore on his left hand material that was later found to be consistent with gunshot residue. Saliba was not apprehended.
The prosecution also called Jeffrey Scott Busch. Busch testified that petitioner had assertedly made a full confession to him one day, of a sudden, while they were both inmates in the Los Angeles County jail, apparently as Busch was peddling cigarettes—Busch working as a trusty with relative freedom of movement around the jail, petitioner waiting to be transported to court, the 2 conversing between 10 and 20 minutes, for the first and only time, through what Busch said was the open-barred door of the cell in which petitioner was being held on the so-called “court line.” At its core, the “confession" related that petitioner participated in the Arikan assassination together with, according to Busch,
two
partners; it also related that petitioner
acted with an anti-Turkish motive. Busch’s testimony was directly corroborated, in part, as to the fact of the “confession” by another inmate, who said he heard petitioner mention “murder” to Busch. It was circumstantially corroborated, in part, as to the substance of the “confession” by one of the eyewitnesses at the Wilshire-Comstock intersection, who said the man on the southwest comer kept looking toward a hotel along Arikan’s customary route—which in the prosecution’s view suggested the participation of a third person, in addition to petitioner and Saliba, as a spotter on the hotel’s roof. Busch generally denied that he had “prepared” his testimony with the help of others, including the authorities and fellow inmates.
Without taking the stand himself, petitioner put forth a defense of alibi and mistaken identity. In addition, he attacked Busch’s testimony as fabricated. To that end, he subjected Busch to extensive impeachment and also exploited the similarly extensive impeachment to which the prosecution had already subjected Busch in anticipation. He made the following points, among others.
As to the fact of the “confession,” Busch was apparently dubious on the circumstances. There was at least some question whether he was in fact a trusty; whether he could have been walking on the “court line,” selling cigarettes, and talking to other inmates, all in violation of regulations, under the very eyes of the jailers; whether he would have been allowed to engage petitioner in conversation, extended or otherwise, inasmuch as petitioner was in “keep-away” custody in a high-profile murder case; whether he would have been given a confession by petitioner, who had never met him previously and was surrounded by jailers; and whether he could have taken a confession from petitioner, who was apparently in a cell with a door that was solid and closed, and not open-barred as he had stated.
As to the substance of the “confession,” Busch was wrong on several matters. He incorrectly identified the location of the Arikan assassination as the Avenue of the Stars in Century City—which happened to be near the former Turkish consulate, the address of which might have been obtained from an out-of-date telephone directory. He incorrectly identified the weapons used by the assassins as 9-millimeter pistols; as noted, they included a .45-caliber pistol, which petitioner himself wielded. He incorrectly identified the two partners he said acted with petitioner as bearing Armenian surnames similar to “Tejerían” and “Yeghoian”; these surnames belonged to certain persons, unconnected to the assassination, who happened to be former acquaintances of a fellow jailhouse informant—a man who disclosed at trial that he had schemed to fabricate testimony against petitioner.
In addition, Busch admitted that he had been convicted more than once of the felony of burglaiy; that he was then in prison; that he had previously
acted as a jailhouse informant; that he had obtained information relating to the Arikan assassination from another inmate; that he did not immediately reveal petitioner’s “confession” to the authorities and, when he did do so, did not reveal all its details; that he had been unable to identify petitioner in a photographic show-up; and that he had solicited—but claimed he had not received and did not expect—benefits and/or promises of benefits from the authorities (in the form of protection, change of identity, relocation, money, favorable disposition of criminal matters, etc.) in exchange for his testimony against petitioner.
Finally, Busch was confronted from the witness stand by other past and present inmates, who stated that his testimony was false and described how he engineered its fabrication.
The jury returned a verdict finding petitioner guilty of the first degree murder of Arikan. At the same time, it found true a national-origin special-circumstance allegation—specifically, that petitioner intentionally killed Arikan because he was Turkish—which enhanced punishment to either death or life imprisonment without possibility of parole.
At the penalty phase, the prosecution presented no evidence in aggravation, resting on what had been introduced at the guilt phase. For his part, again without taking the stand himself, petitioner presented evidence in mitigation, comprising testimony by his mother, an aunt, and a psychiatrist concerning his troubled background and his good character.
The jury returned a verdict fixing the punishment for petitioner at life imprisonment without possibility of parole.
In a reported decision, the Court of Appeal, Second Appellate District, Division Seven affirmed.
(People
v.
Sassounian
(1986) 182 Cal.App.3d 361 [226 Cal.Rptr. 880].) On guilt, the
Sassounian
court was unanimous. But on punishment, specifically, the national-origin special-circumstance finding and the dependent sentence of life imprisonment without possibility of parole, it was not. Apparently as a result of overhearing certain comments at a bench conference, some jurors received information they understood to concern a telephone call to the Turkish consulate threatening, or claiming responsibility for, the Arikan assassination. In this, two justices found juror misconduct but no prejudice. One justice found both, and would have reversed as to punishment. The court, however, was at one in rejecting a claim of insufficiency of the evidence against the national-origin special-circumstance finding—a point that was based on an assertion that Busch’s testimony was “inherently incredible.”
(Id.
at p. 408; see
id.
at p. 423 (conc.
& dis. opn. of Johnson, J.).) It did not itself purport to credit Busch’s testimony, but merely could not conclude that it was “either physically impossible or demonstrably false without resort to inferences or deductions.”
(Id.
at p. 409; see
id.
at p. 423 (conc. & dis. opn. of Johnson, J.).) We denied review.
Subsequently, petitioner filed a petition for writ of habeas corpus in the Superior Court of Los Angeles County, asking it to vacate its earlier judgment, based, in part, on a declaration by Busch recanting his testimony.
The court ordered the Director of Corrections to show cause why petitioner should not be granted the relief he sought. The Director of Corrections filed a return, based, in part, on a declaration by Busch recanting his recantation. Petitioner next filed a traverse. The Director of Corrections then filed a “response.” The court proceeded to deny the petition on the merits.
Thereupon, petitioner filed in this court the petition for writ of habeas corpus out of which the present proceeding has arisen. This petition is substantially the same as that earlier filed in the Superior Court of Los Angeles County. After consideration, we ordered the Director of Corrections to show cause before the Court of Appeal, Second Appellate District, why petitioner should not be granted the relief he sought
as to punishment
only—specifically, the national-origin special-circumstance finding and the dependent sentence of life imprisonment without possibility of parole—on one or both of the following claims: (1) contrary to Penal Code section 1473, false evidence that was substantially material or probative on that issue had been introduced against him at trial, viz., Busch’s testimony; and (2) in violation of the due process clause of the Fourteenth Amendment to the United States Constitution, the prosecution had not disclosed evidence that was favorable to him and material on that issue, viz., evidence impeaching Busch, including benefits and/or promises of benefits from the authorities in exchange for his testimony.
In the Court of Appeal, Second Appellate District, the proceeding was assigned to Division Seven. The Director of Corrections filed a return. Petitioner then filed a traverse.
The court ordered the matter submitted. It subsequently vacated the submission. Thereupon, it appointed a referee to conduct an evidentiary hearing in order to find whether Busch’s testimony
was credible in light of his later recantation and his still-later recantation of his recantation.
After the evidentiary hearing, the referee found in the affirmative; but he also made various other “determinations” that were inflammatory or immaterial or both. In an unreported decision, the court proceeded to deny the petition on the merits. Two justices concluded that petitioner had failed to carry his burden of proof on either the false evidence or the prosecutorial nondisclosure claim, determining, inter alia, that the referee’s finding on the credibility of Busch’s testimony was supported by substantial evidence. One justice dissented—the same who had concurred and dissented on petitioner’s appeal—stating that he had “serious reservations about whether the referee . . . adequately performed the mission he was assigned.”
We granted review, and now affirm.
II
The substantive law that governs this proceeding may be briefly stated, as follows.
Under the due process clause of the Fourteenth Amendment to the United States Constitution, a prisoner may seek relief in habeas corpus on the ground that the prosecution did not disclose evidence.
The prosecution has a duty under the Fourteenth Amendment’s due process clause to disclose evidence to a criminal defendant. (See, e.g.,
United States
v.
Bagley
(1985) 473 U.S. 667, 674-678 [87 L.Ed.2d 481, 488-492, 105 S.Ct. 3375] [hereafter sometimes
Bagley].)
But such evidence must be both favorable to the defendant and material on either guilt or punishment.
(United States
v.
Bagley, supra,
473 U.S. at p. 674 [87 L.Ed.2d at pp. 488-489].)
Evidence is “favorable” if it either helps the defendant or hurts the prosecution, as by impeaching one of its witnesses. (See
United States
v.
Bagley, supra,
473 U.S. at p. 676 [87 L.Ed.2d at p. 490].)
Evidence is “material” “only if there is a reasonable probability that, had [it] been disclosed to the defense, the result. . . would have been different.”
(United States
v.
Bagley, supra,
473 U.S. at p. 682 [87 L.Ed.2d at p. 494] (lead opn. by Blackmun, J.), relying on
Strickland
v.
Washington
(1984) 466 U.S. 668, 694 [80 L.Ed.2d 674, 697-698 104 S.Ct. 2052] [dealing with ineffective assistance of counsel in violation of the Sixth Amendment]; accord,
United States
v.
Bagley, supra,
473 U.S. 667, 685 [87 L.Ed.2d 481, 496] (cone. opn. of White, J.).) The requisite “reasonable probability” is a probability sufficient to “undermine[] confidence in the outcome” on the part of the reviewing court.
(United States
v.
Bagley, supra,
473 U.S. 667, 678 [87 L.Ed.2d 481, 491-492]; accord,
id.
at p. 682 [87 L.Ed.2d at p. 494] (lead opn. by Blackmun, J.), relying on
Strickland
v.
Washington, supra, 466
U.S. at p. 694 [80 L.Ed.2d at pp. 697-698] [dealing with ineffective assistance of counsel in violation of the Sixth Amendment]; see
United States
v.
Bagley, supra,
473 U.S. 667, 685 [87 L.Ed.2d 481, 496] (cone. opn. of White, J.).) It is a probability assessed by considering the evidence in question under the totality of the relevant circumstances and not in isolation or in the abstract. (See
United States
v.
Bagley, supra,
473 U.S. at p. 685 [87 L.Ed.2d at p. 496] (cone. opn. of White, J.).) Further, it is a probability that is, as it were, “objective,” based on an “assumption that the decisionmaker is reasonably, conscientiously, and impartially applying the standards that govern the decision,” and not dependent on the “idiosyncracies of the particular decisionmaker,” including the “possibility of arbitrariness, whimsy, caprice, ‘nullification,’ and the like.”
(Strickland
v.
Washington, supra, 466
U.S. at p.
695 [80 L.Ed.2d at p. 698] [dealing with ineffective assistance of counsel in violation of the Sixth Amendment].)
Thus, to merit relief on this basis, the prisoner must show both the favorableness and the materiality of any evidence not disclosed by the prosecution, as defined above. (See
United States
v.
Bagley, supra,
473 U.S. at pp. 674-678 [87 L.Ed.2d at pp. 488-492],)
In addition, under Penal Code section 1473, a prisoner may seek relief in habeas corpus on, among other grounds, that “[fjalse evidence that is substantially material or probative on the issue of guilt or punishment was introduced against [him] at any hearing or trial relating to his incarceration . . . (Pen. Code, § 1473, subd. (b)(1).)
False evidence is “substantially material or probative” if it is “of such significance that it may have affected the outcome,” in the sense that
“with reasonable probability
it
could have
affected the outcome . . . .”
(In re Wright
(1978) 78 Cal.App.3d 788, 814 [144 Cal.Rptr. 535], italics added (per Kaufman, J.).) In other words, false evidence passes the indicated threshold if there is a “reasonable probability” that, had it not been introduced, the result would have been different.
(Ibid.)
The requisite “reasonable probability,” we believe, is such as undermines the reviewing court’s confidence in the outcome. (Cf.
United States
v.
Bagley, supra,
473 U.S. at p. 678 [87 L.Ed.2d at pp. 490-491] [dealing with prosecutorial nondisclosure of evidence in violation of the Fourteenth Amendment’s due process clause].) It is dependent on the totality of the relevant circumstances.
(In re Wright, supra,
78 Cal.App.3d at p. 817.) It is also, we believe, determined objectively. (Cf.
Strickland
v.
Washington, supra,
466 U.S. at p. 695 [80 L.Ed.2d at p. 698] [dealing with ineffective assistance of counsel in violation of the Sixth Amendment].)
Thus, to merit relief on this basis, the prisoner must show that any false evidence introduced against him was substantially material or probative, as defined above. (See Pen. Code, § 1473, subd. (b)(1); see also
In re Wright, supra,
78 Cal.App.3d at pp. 807-821 [construing and applying Pen. Code, § 1473, subd. (b)(1)].)
Like the substantive law, the procedural law that is applicable here may be concisely presented.
In a proceeding in habeas corpus, the petitioner bears the “burden ... of alleging ... the facts on which he relies in support of his claim [or claims] for relief . . . .”
(In re Lawler
(1979) 23 Cal.3d 190, 195 [151 Cal.Rptr. 833, 588 P.2d 1257].) He also “bears the burden of proving [those] facts . . . by a preponderance of the evidence.”
(People
v.
Ledesma
(1987) 43
Cal.3d 171, 243 [233 Cal.Rptr. 404, 729 P.2d 839] (conc. opn. of Grodin, J.).)
In issuing an order to show cause in such a proceeding, a court makes “an implicit preliminary determination” as to claims
within the order
that the petitioner has carried his burden of allegation, that is, that he “has made a sufficient prima facie statement of specific facts which, if established, entitle him to . . . relief . . . .”
(In re Hochberg
(1970) 2 Cal.3d 870, 875, fn. 4 [87 Cal.Rptr. 681, 471 P.2d 1].) That determination, it must be emphasized, is truly “preliminary": it is only initial and tentative, and not final and binding. In issuing the order to show cause, the court also makes “an implicit determination" as to claims
outside the order
that the petitioner has failed to carry his burden of allegation, that is, that he has “failed to make a prima facie case . . . .”
(People
v.
Miranda
(1987) 44 Cal.3d 57, 119, fn. 37 [241 Cal.Rptr. 594, 744 P.2d 1127].) That determination is not preliminary. It may, of course, be changed. But unless changed, it stands.
III
On review, our question is, was the Court of Appeal correct in denying the petition for writ of habeas corpus? For the reasons that follow, our answer is, yes.
In issuing our order to show cause, we had preliminarily determined that petitioner had carried his burden of allegation as to two claims and two claims alone. The first was the introduction at trial of false evidence that was substantially material or probative
on
punishment—specifically, the national-origin special-circumstance finding and the dependent sentence of life imprisonment without possibility of parole—viz., Busch’s testimony. The second was the nondisclosure by the prosecution of evidence that was favorable to him and material
on that issue,
viz., evidence impeaching Busch, including benefits and/or promises of benefits from the authorities in exchange for his testimony.
In part we adhere to this preliminary determination, but in part we do not. We are now of the opinion that petitioner has failed to carry his burden of allegation as to
any
claim.
Specifically, we believe that petitioner has failed to carry his burden of alleging that the introduction at trial of false evidence that was substantially material or probative on the national-origin special-circumstance finding. He stumbles on
substantial materiality or probativeness.
Considered in itself, Busch’s testimony is hard to assign a weight. To be sure, it related petitioner’s “confession,” which provided the only direct
evidence that he intentionally killed Arikan because he was Turkish. Without question, a confession can “operate[] as a kind of evidentiary bombshell which shatters the defense.”
(People
v.
Schader
(1965) 62 Cal.2d 716, 731 [44 Cal.Rptr. 193, 401 P.2d 665], overruled on another ground,
People
v.
Cahill
(1993) 5 Cal.4th 478, 509-510, fn. 17 [20 Cal.Rptr.2d 582, 853 P.2d 1037]; accord,
Arizona
v.
Fulminante
(1991) 499 U.S. 279, 296 [113 L.Ed.2d 302, 322, 111 S.Ct. 1246] (opn. of White, J., for the court);
id.
at p. 313 [113 L.Ed.2d at pp. 333-334] (cone. opn. of Kennedy, J.).) It is undoubtedly in recognition of this fact that Busch was characterized as a “very strong” and “significant” witness by the trial court. Nevertheless, whatever effect his testimony might have had depends on whether the jury found it believable. Whether it did is open to question.
Certainly, Busch was extensively impeached. (See,
ante,
at p. 540.) As a consequence, the “testimonial thread” that he plied became severely “tattered.”
(People
v.
Sassounian, supra,
182 Cal.App.3d 361, 423 (conc. & dis. opn. of Johnson, J.).)
Separate and apart from Busch’s testimony, however, there was overwhelming evidence relating to the crime of first degree murder. Together with another gunman, petitioner intentionally killed Arikan, and did so with premeditation and deliberation. (See,
ante,
at pp. 538-539.) In a word, “there was nothing ‘close’ about this” issue.
(People
v.
Sassounian, supra,
182 Cal.App.3d at p. 397.)
Even without Busch’s testimony, this overwhelming evidence supports only one reasonable inference as to the national-origin special circumstance. Petitioner intentionally killed Arikan because he was Turkish.
Specifically, this evidence shows that he must have had a motive: his act was hardly “spontaneous.” It also shows that his motive must have been anti-Turkish: his purpose evidently sprang from his “bad feelings towards the Turkish people for the things that they had done [to Armenians] in the past” and his view that “Turks are animals.” It does
not
show any other possible motive, such as personal animus, kidnapping, or theft.
In view of the foregoing, we conclude that it is not reasonably probable that petitioner could have obtained a different result in the absence of Busch’s testimony. As a result, our confidence in the outcome is not undermined.
We also believe that petitioner has failed to carry his burden of alleging the nondisclosure by the prosecution of evidence that was favorable to him and material on the national-origin special-circumstance finding. He stumbles on
materiality.
Our conclusion here is compelled by our conclusion above. Because it is not reasonably probable that he could have obtained a different result in the absence of Busch’s testimony in its entirety, it is not reasonably probable that he could have obtained a different result in the absence of evidence that would merely have subjected Busch himself to impeachment—or better,
further
impeachment (see,
ante,
pp. 540-541). For the most that such evidence could have done would have been to render Busch’s testimony a nullity. As a result, our confidence in the outcome is not undermined.
In concluding that petitioner has failed to carry his burden of allegation, we necessarily conclude that he has failed to carry his burden of proof. Consequently, we need not, and do not, pass on the soundness of the reasoning that the Court of Appeal employed to arrive at the same result,
including its determination that the referee’s finding on the credibility of Busch’s testimony was supported by substantial evidence.
IV
For the reasons stated above, we conclude that the judgment of the Court of Appeal must be affirmed.
It is so ordered.
Lucas, C. J., Kennard, J., George, J., Werdegar, J., Woods (A. M.), J.,
and Ramirez, J.,
concurred.