Mr. Justice Brennan
delivered the opinion of the Court.
After a government witness testifies on direct examination in a federal criminal prosecution the trial court is required, under the so-called Jencks Act,1 on motion of [87]*87the defendant, to order the United States to produce, for impeachment purposes, defined pretrial statements of the witness, or parts of such statements as determined under subsection (c), which relate to the subject matter of his trial testimony and are in the possession of the United States. The conviction of the petitioners in the District Court for the District of Massachusetts for bank robbery in violation of 18 U. S. C. § 2113 was sustained by the Court of Appeals for the First Circuit. 269 F. 2d 688. During the trial the court ordered the Government to produce a document described on cross-examination by one of its witnesses in terms which satisfy the definition of a “statement” under the Act. The Government denied having possession of such a document. It did, however, [88]*88admit possession of an Interview Report of an interview by an FBI agent with that witness, but contended that this report fell outside the statute. The trial judge held an inquiry without the jury present, at the conclusion of which he refused to order the United States to deliver the Interview Report to the petitioners, and also denied their motion to strike the testimony of the witness. The procedure at that inquiry raises questions important in the administration of the Jencks Act, and we granted certio-rari limited to the review of those questions. 362 U. S. 909.
The government witness was Dominic Staula, a depositor who was in the bank at the time of the robbery. On direct examination he identified the petitioner Lester as [89]*89one of the robbers. When asked on cross-examination whether he made any statements to government agents before the trial, he said that an agent of the Federal Bureau of Investigation who interviewed him during the week following the robbery wrote down such a statement. His recollection of what occurred at the interview was not entirely clear,2 but the trial judge ruled that he had made a statement satisfying the requirements of the Jencks Act and ordered the United States to produce it. The Assist[90]*90ant United States Attorney presenting the Government’s case stated that he had no such paper as the witness described. He stated further that the only document in the possession of the prosecution was not a "statement” within the statute, but a typed Interview Report3 of FBI Special Agent Toomey prepared and transcribed after the interview at a time unknown to the Assistant. The Assistant refused to deliver the report to petitioners’ counsel but delivered it to the judge for his inspec[91]*91tion. To the court’s question whether the Government possessed “any statement that was copied by an FBI Agent which in any way would reflect a statement that this witness made and which he substantially adopted [92]*92as the statement,” the Assistant replied “No, your Honor, we don’t.” To the further question whether “the United States [has] in its possession any notes that were taken down by the FBI Agent at the time this witness was interviewed,” the Assistant answered, “I do not have them in my possession and I do not know whether they ever existed.”
The Jencks Act limits access by defendants to such government papers as fit the Act’s definition of “statements” which relate to the subject matter as to which the witness has testified, Palermo v. United States, 360 U. S. 343. However, the statute requires that the judge shall, on motion of the defendant, after a witness called by the United States has testified on direct examination, order the United States, for impeachment purposes, to produce any such “statements.” To that extent, as the legislative history makes clear, the Jencks Act “reaffirms” our holding in Jencks v. United States, 353 U. S. 657, that the defendant on trial in a federal criminal prosecution is entitled, for impeachment purposes, to relevant and competent statements of a government witness in possession of the Government touching the events or activities as to which the witness has testified at the trial.. S. Rep. No. 981, 85th Cong., 1st Sess., p. 3. And see H. R. Rep. No. 700, 85th Cong., 1st Sess., pp. 3-4. The command of the statute is thus designed to further the fair and just administration of criminal justice, a goal of which the judiciary is the special guardian.
After an overnight recess the trial judge conducted an inquiry without the jury present to take testimony and hear argument of counsel. Plainly enough this was a proper, even a required, proceeding in the circumstances. Determination of the question whether the Government should be ordered to produce government papers could not be made from a mere inspection of the Interview Report, but only with the help of extrinsic evidence. The [93]*93situation was different from that governed by subsection (c), in which the Government admits that a document in its possession is a “statement” but submits the paper for the judge’s in camera inspection to delete matter which the Government contends does not relate to the subject matter of the testimony of the witness. The situation was similar to that in Palermo, where the Government also contended that a paper in its possession was not a “statement.” We there approved the procedure of taking extrinsic testimony out of the presence of the jury to assist the judge in reaching his determination whether to order production of the paper. We said, at 354-355, “It is also the function of the trial judge to decide, in light of the circumstances of each case, what, if any, evidence extrinsic to the statement itself may or must be offered to prove the nature of the statement.”
In this case the aid of extrinsic evidence was required to answer the following questions bearing on the petitioners’ motions:
Did Toomey write down what Staula told him at the interview? If so, did Toomey give Staula the paper “to read over, to make sure that it was right,” and did Staula sign it?
Was the Interview Report the paper Staula described, or a copy of that paper? In either case, as the trial judge ruled, the Interview Report would be a producible “statement” under subsection (e) (1). “Statements” under that subsection are not limited to such as the witness has himself set down on paper. They include also a statement written down by another which the witness • “signed or otherwise adopted or approved” as a statement “made by said witness.” True, the report does not bear Staula’s signature and the witness testified “I think I had to sign” the original paper. Hbwever, if the paper was otherwise adopted or approved by the witness, [94]*94his signature was not essential. See Bergman v. United States, 253 F. 2d 933, 935, note 1; United States v. Tomaiolo, 280 F. 2d 411, 413.
If the Interview Report was not the original or a copy of the paper Staula described, what became of the paper?
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Mr. Justice Brennan
delivered the opinion of the Court.
After a government witness testifies on direct examination in a federal criminal prosecution the trial court is required, under the so-called Jencks Act,1 on motion of [87]*87the defendant, to order the United States to produce, for impeachment purposes, defined pretrial statements of the witness, or parts of such statements as determined under subsection (c), which relate to the subject matter of his trial testimony and are in the possession of the United States. The conviction of the petitioners in the District Court for the District of Massachusetts for bank robbery in violation of 18 U. S. C. § 2113 was sustained by the Court of Appeals for the First Circuit. 269 F. 2d 688. During the trial the court ordered the Government to produce a document described on cross-examination by one of its witnesses in terms which satisfy the definition of a “statement” under the Act. The Government denied having possession of such a document. It did, however, [88]*88admit possession of an Interview Report of an interview by an FBI agent with that witness, but contended that this report fell outside the statute. The trial judge held an inquiry without the jury present, at the conclusion of which he refused to order the United States to deliver the Interview Report to the petitioners, and also denied their motion to strike the testimony of the witness. The procedure at that inquiry raises questions important in the administration of the Jencks Act, and we granted certio-rari limited to the review of those questions. 362 U. S. 909.
The government witness was Dominic Staula, a depositor who was in the bank at the time of the robbery. On direct examination he identified the petitioner Lester as [89]*89one of the robbers. When asked on cross-examination whether he made any statements to government agents before the trial, he said that an agent of the Federal Bureau of Investigation who interviewed him during the week following the robbery wrote down such a statement. His recollection of what occurred at the interview was not entirely clear,2 but the trial judge ruled that he had made a statement satisfying the requirements of the Jencks Act and ordered the United States to produce it. The Assist[90]*90ant United States Attorney presenting the Government’s case stated that he had no such paper as the witness described. He stated further that the only document in the possession of the prosecution was not a "statement” within the statute, but a typed Interview Report3 of FBI Special Agent Toomey prepared and transcribed after the interview at a time unknown to the Assistant. The Assistant refused to deliver the report to petitioners’ counsel but delivered it to the judge for his inspec[91]*91tion. To the court’s question whether the Government possessed “any statement that was copied by an FBI Agent which in any way would reflect a statement that this witness made and which he substantially adopted [92]*92as the statement,” the Assistant replied “No, your Honor, we don’t.” To the further question whether “the United States [has] in its possession any notes that were taken down by the FBI Agent at the time this witness was interviewed,” the Assistant answered, “I do not have them in my possession and I do not know whether they ever existed.”
The Jencks Act limits access by defendants to such government papers as fit the Act’s definition of “statements” which relate to the subject matter as to which the witness has testified, Palermo v. United States, 360 U. S. 343. However, the statute requires that the judge shall, on motion of the defendant, after a witness called by the United States has testified on direct examination, order the United States, for impeachment purposes, to produce any such “statements.” To that extent, as the legislative history makes clear, the Jencks Act “reaffirms” our holding in Jencks v. United States, 353 U. S. 657, that the defendant on trial in a federal criminal prosecution is entitled, for impeachment purposes, to relevant and competent statements of a government witness in possession of the Government touching the events or activities as to which the witness has testified at the trial.. S. Rep. No. 981, 85th Cong., 1st Sess., p. 3. And see H. R. Rep. No. 700, 85th Cong., 1st Sess., pp. 3-4. The command of the statute is thus designed to further the fair and just administration of criminal justice, a goal of which the judiciary is the special guardian.
After an overnight recess the trial judge conducted an inquiry without the jury present to take testimony and hear argument of counsel. Plainly enough this was a proper, even a required, proceeding in the circumstances. Determination of the question whether the Government should be ordered to produce government papers could not be made from a mere inspection of the Interview Report, but only with the help of extrinsic evidence. The [93]*93situation was different from that governed by subsection (c), in which the Government admits that a document in its possession is a “statement” but submits the paper for the judge’s in camera inspection to delete matter which the Government contends does not relate to the subject matter of the testimony of the witness. The situation was similar to that in Palermo, where the Government also contended that a paper in its possession was not a “statement.” We there approved the procedure of taking extrinsic testimony out of the presence of the jury to assist the judge in reaching his determination whether to order production of the paper. We said, at 354-355, “It is also the function of the trial judge to decide, in light of the circumstances of each case, what, if any, evidence extrinsic to the statement itself may or must be offered to prove the nature of the statement.”
In this case the aid of extrinsic evidence was required to answer the following questions bearing on the petitioners’ motions:
Did Toomey write down what Staula told him at the interview? If so, did Toomey give Staula the paper “to read over, to make sure that it was right,” and did Staula sign it?
Was the Interview Report the paper Staula described, or a copy of that paper? In either case, as the trial judge ruled, the Interview Report would be a producible “statement” under subsection (e) (1). “Statements” under that subsection are not limited to such as the witness has himself set down on paper. They include also a statement written down by another which the witness • “signed or otherwise adopted or approved” as a statement “made by said witness.” True, the report does not bear Staula’s signature and the witness testified “I think I had to sign” the original paper. Hbwever, if the paper was otherwise adopted or approved by the witness, [94]*94his signature was not essential. See Bergman v. United States, 253 F. 2d 933, 935, note 1; United States v. Tomaiolo, 280 F. 2d 411, 413.
If the Interview Report was not the original or a copy of the paper Staula described, what became of the paper?
In any event, even if the Interview Report was not the original or a copy of the paper Staula described, had Staula read over and approved the Interview Report? In such case the report would be producible under subsection (e)(1) although not related to the paper Staula described. Or was the Interview Report a substantially verbatim recital of an oral statement which the agent had recorded contemporaneously? If extrinsic evidence established this, the report would be producible under subsection (e)(2). Palermo v. United States, at 351-352.
The obvious witness to call was Special Agent Toomey who, the parties agreed, was readily available. Defense counsel suggested that the agent be called “to explain where he got the . . . [Interview Report],” and also because “Mr. Toomey could easily say what he has done with the original writing.” Defense counsel were not in a position also to appreciate the significance of Toomey’s testimony to the possible producibility of the Interview Report itself. Consistent with our admonition in Palermo, 360 U. S., at 354, that “It would indeed defeat this design [to limit defense access to government papers] to hold that the defense may see statements in order to argue whether it should be allowed to see them,” neither the Government nor the judge permitted them to inspect it. From his own inspection, however, the judge was aware of the significance which Toomey’s evidence might have on the judge’s determination whether he should order the Government to turn over the Interview Report to the [95]*95defense. The Interview Report resembles the statement Staula described and the judge indicated that he would order its production if it was that statement or a copy of it, or although not the original or a copy, if Staula had read and approved it, or if it was a contemporaneously recorded substantially verbatim recital of Staula’s oral statement. Nevertheless, the judge ruled that it was for the petitioners to subpoena Toomey as “their witness” if they believed his testimony would support their motions, and that he would not of his own motion summon Toomey to testify, or require the Government to produce him. We think that this ruling was erroneous.
The inquiry being conducted by the judge was not an adversary proceeding in the nature of a trial controlled by rules governing the allocation between the parties of the burdens of proof or persuasion. The inquiry was simply a proceeding necessary to aid the judge to discharge the responsibility laid upon him to enforce the statute. The function of prosecution and defense at the inquiry was not so much a function of their adversary positions in the trial proper, as it was a function of their duty to come forward with relevant evidence which might assist the judge in the making of his determination. These considerations standing alone suggest that the emphasis on the petitioners' burden to produce the evidence was misplaced. The statute says nothing of burdens of producing evidence. Rather it implies the duty in the trial judge affirmatively to administer the statute in such way as can best secure relevant and available evidence necessary to decide between the directly opposed interests protected by the statute — the interest of the Government in safeguarding government papers from disclosure, and the interest of the accused in having the Government produce “statements” which the statute requires to be produced.
[96]*96The circumstances of this case clearly required that the judge call Toomey of his own motion or require the Government to produce him. Not only did the Government have the advantage over the defense of knowing the contents of the Interview Report but it also had the advantage of having Toomey in its employ and presumably knew, or could readily ascertain from him, the facts about the interview. In addition to the consideration that the interest of the United States in a criminal prosecution “. . . is not that it shall win a case, but that justice shall be done, . . .” Berger v. United States, 295 U. S. 78, 88, the ordinary rule, based on considerations of fairness, does not place the burden upon a litigant of establishing facts peculiarly within the knowledge of his adversary. United States v. New York, N. H. & H. R. Co., 355 U. S. 253, 256, note 5. Moreover, the petitioners’ cross-examination of Staula had shown a prima jade case of their entitlement to a statement, and, at the least, the judge should have required the Government to come forward with evidence to answer that case. Cf. United States v. Costello, 145 F. Supp. 892, 894-895, note 13. Since the Interview Report was not, and under Palermo could not be, made available to the petitioners, and they thus had no way of knowing the significance of its contents to the question the judge was to determine, it saddled an unfairly severe burden on them to require them to subpoena Toomey as “their witness.” In the role of petitioners’ witness, they would be groping in the dark in questioning him, and they might be bound by his answers. As a witness called by the Government or even as the court’s witness, they would have a latitude in cross-examination to which the circumstances entitled them.
Instead of calling Toomey or having the Government call him, the trial judge fell into further error by relying upon Staula to supply the information he sought. Over the objection of government counsel that the Interview [97]*97Report had not been “recorded contemporaneously with the making of such oral statement,” and over the objection of the petitioners that “If this man now reads that statement it loses its effect for purposes of impeachment,” the judge directed Staula to read the Interview Report and say whether he was familiar with it. The witness said that he had never seen the report. The judge then asked Staula “. . . is that a substantially verbatim recital of what you told Agent Toomey?” The witness replied, “That’s not written up just the way the story is.” “There are things in there turned around.” It was after this testimony was elicited from Staula that the judge ruled he would not order the delivery of the Interview Report to the petitioners, and denied their motion to strike the witness’ testimony.
Reliance upon the testimony of the witness based upon his inspection of the controverted document must be improper in almost any circumstances. The very question being determined was whether the defense should have the document for use in cross-examining the witness. Under Palermo, the trial judge was not to allow the defense to inspect the Interview Report “in order to argue whether it should be allowed to see” it, since to do so would be inconsistent with the congressional purpose to limit access to government papers. Similarly, Staula should not have been allowed to inspect the Interview Report, since there necessarily inhered in the witness’ inspection of the paper the obvious hazard that his self-interest might defeat the statutory design of requiring the Government to produce papers which are “statements” within the statute. For example, the Interview Report states that Staula was unable to give any description of one of the robbers. This is in sharp contrast to his positive identification of Lester made on direct examination. Experienced trial judges and lawyers will readily understand the value of the use of the report on cross-examina[98]*98tion of the witness. But the petitioners were deprived of the opportunity to make use of the report by the obviously self-serving declarations of the witness that it did not accurately record what he told the agent.
Moreover, failure of the judge to call for Toomey’s testimony foreclosed a proper determination of the petitioners’ motion to strike the witness’ testimony. If the Interview Report was not the original or a copy of the paper Staula described, and that paper was destroyed, the petitioners might have been denied a statement to which they were entitled under the statute. Thus, even if the Interview Report itself were producible, a situation might have arisen calling for decision whether subsection (d) of the statute required the striking of the testimony of the witness. The parties argue whether destruction may be regarded as the equivalent of noncompliance with an order to produce under that subsection. The Government contends that only destruction for improper motives or in bad faith should be so regarded. The petitioners contend that destruction without regard to the circumstances should be so regarded. However, this record affords us no opportunity to decide this important question of the construction of subsection (d). We do not yet know that such a paper existed, and was destroyed, or the circumstances of its destruction, nor can we know without the benefit at least of Toomey’s testimony.
We conclude that because of these errors in the conduct of the inquiry the petitioners are entitled to a redeter-mination of their motion for the production of Staula’s pretrial statements, and of their motion to strike his testimony. However, we do not think that this Court should vacate their conviction and order a new trial. The petitioners’ rights can be fully protected by a remand to the trial court with direction to hold a new inquiry consistent with this opinion. See United States v. Shotwell [99]*99Mfg. Co., 355 U. S. 233. The District Court will supplement the record with new findings and enter a new final judgment of conviction if the court concludes upon the new inquiry to reaffirm its former rulings. This will preserve to the petitioners the right to seek further appellate review on the augmented record. On the other hand, if the court concludes that the Government should have been required to deliver the Interview Report or other statement to the petitioners, or that it should have granted their motion to strike Staula’s testimony, the court will vacate the judgment of conviction and accord the petitioners a new trial.
The judgment of the Court of Appeals is therefore vacated and the case is remanded to the District Court for further proceedings consistent with this opinion.
It is so ordered.