none of the relevant decisions of this court, it may be educational, particularly for the Government whose default in this regard is truly incredible, for us to deal with the subject at greater length than would otherwise be justified.
The starting point for discussion is Roviaro v. United States, 353 U.S. 53, 77 S.Ct. 623, 1 L.Ed.2d 639 (1957). We say starting point because, as is frequently forgotten, the holding, 353 U.S. at 60-61, 77 S.Ct. at 627, “Where the disclosure of an informer’s identity, or of the contents of his communication, is relevant and helpful to the defense of an accused, or is essential to a fair determination of a cause, the privilege [to withhold disclosure of the identity of informers] must give way,” was addressed to a situation where disclosure was claimed to be necessary on the issue of guilt. In significant contrast to the instant case, the informer in Roviaro “had helped to set up the criminal occurrence and had played a prominent part in it,” 353 U.S. at 64, 77 S.Ct. at 629. Access to his testimony might have enabled the defense to raise questions concerning the defendant’s knowledge of the contents of the package he was transporting, an essential element of the charge against him, as well as the possibility of entrapment, whereas in the case before us the sole function of the informer was to alert the police that criminal activity was afoot. However, the Court did state in support of its conclusion:
Most of the federal cases involving thi= limitation on the scope of the informer’s privilege have arisen where the legality of a search without a warrant is in issue and the communications of an informer are claimed to establish probable cause. In these cases the Government has been required to disclose the identity of the informant unless there was sufficient evidence apart from his confidential communication.11
Four cases were cited in footnote 11. Only one was a Supreme Court decision, Scher v. United States, 305 U.S. 251, 254, 59 S.Ct. 174, 176, 83 L.Ed. 151 (1938). That case held disclosure was not required since the legality of the officers’ action did “not depend upon the credibility of something told but upon what they, saw and heard,” and distinguished United States v. Blich, 45 F.2d 627 (D.Wyo.1930), where justification of the arrest was “sought because of honest belief based upon credible information.” Wilson v. United States, 59 F.2d 390 (3 Cir. 1932), did accord with the statement, as did United States v. Keown, 19 F.Supp. 639 (W.D.Ky.1937). But the other case cited, United States v. Li Fat Tong, 152 F.2d 650 (2 Cir. 1945), in which Judge A. N. Hand wrote for a bench including Judge L. Hand and Judge Clark, held directly the contrary,4 citing Scher for the proposition that disclosure would be required only when it was “necessary or desirable to show the prisoner’s innocence.” Id. at 652.
In McCray v. Illinois, 386 U.S. 300, 87 S.Ct. 1056, 18 L.Ed.2d 62 (1967), the Court dealt directly with the problem here presented. The decision at least establishes that disclosure of the identity of an informer is not
constitutionally required even though his information is the sole basis for probable cause. However, the opinion went beyond this. Seemingly it indicated sympathy with the Illinois rule that disclosure would not be invariably required even under such circumstances, see People v, Durr, 28 Ill.2d 308, 192 N.E.2d 379 (1963), cert. denied,
376 U.S. 973, 84 S.Ct. 1138, 12 L.Ed.2d 87 (1964), a view which was characterized as “consistent with the law of many other States,” 386 U.S. at 305, 87 S.Ct. at 1059, and with the New Jersey rule, State v. Burnett, 42 N.J. 377, 201 A.2d 39 (1964), allowing “the judge who
4
Although the Li Fat Tong opinion made some point of the fact that the New York agent who made the arrest had obtained his information from a Chicago agent, the latter had gotten his information from an unidentified informer.