TALBOT SMITH, Senior District Judge.
The petitioner before us was convicted in the Iowa District Court for Black Hawk County of possession of heroin with intent to deliver.1 His conviction was affirmed by the Supreme Court of Iowa.2 Petitioner (hereafter defendant) subsequently brought a petition for writ of habeas corpus,3 denied by the District Court, Northern Division of Iowa, from which denial appeal is taken to this court.
The sole witness to the alleged crime was one Roosevelt Nabors, a/k/a Alvin Banks. Nabors testified that he arranged for, and then witnessed, a sale between defendant and one Glenn “Bub-ba” Phillips.
Nabors, the record discloses, was a professional informant. He has, he testified, “worked throughout the State of Michigan,” in Canada, in New York, and in Ohio. He met with police officers and narcotics agents in Chicago in answer to “a flier out from the State of Iowa, requesting an undercover, and we was answering the flier.” After a conference concerning working in Iowa he proceeded, with agents and his “girl friend” to Waterloo, Iowa. There he was shown pictures of suspects and it was suggested to him that defendant might be one of them. His assigned duties were to become known in black and white neighborhoods, “develop information and, if possible, make purchases, make buys of hard drugs, which is known as heroin.”
His compensation did not depend upon the cases he “made” but covered his living expenses, “food, rent, [and] so forth,” including those of his female companion, the total amounting to some twelve hundred dollars in this case, plus “help” on occasion with the expenses of a car he had obtained. What his local employment arrangements were, besides his un[558]*558dercover work, are not clear from the record, since objection to a question as to the details of Agent (not to be confused with defendant) Johnson’s conceded “dealings” with the informant’s employer was sustained. In addition the informant had opportunity, of which he availed himself, of making a little money on the side. Thus he received $200, unreported to his superiors, for introducing “people [who] wanted to buy some heroin” to “a guy that was in this line of business.”
The principal issue before us concerns his attempted impeachment. He testified that immediately prior to his coming to Iowa he had worked in Muskegon, Michigan, and that his modus operandi, save as to the quantity of heroin bought, there was basically as in Iowa. In Muskegon, he testified, he had made a “buy” from one Matt Durda, Jr., and had so informed the authorities. After more foundational questions defendant then made an offer of proof, set forth in extenso in the margin hereof.4 What he [559]*559offered to prove in substance was that the Muskegon case was a “frame-up”5 by this informant-witness and that the Muskegon County Attorney had accordingly moved the court for dismissal of the charges.6 The offer of proof was rejected by the trial court on the ground that it was immaterial, and a collateral matter, concerning which extrinsic testimony was not admissible. The defendant argues that, under these unique facts, the foreclosure of his defense as to the alleged mendacity of the informant went far beyond mere “error” as to the introduction of evidence but was so gross and decisive as to amount to a deprivation of due process.
We here consider, then, the unique problems presented by the testimony of the paid informer. His employment has been the subject of extensive commentary, little or none of it approbative.7
That his motivation may well be to make good in his employment by producing violators is commonly known. As we stated in United States v. Barnes, 486 F.2d 776, 780 (8th Cir. 1973):8
The practice of the Government in employing agent-informers in narcotics cases is well known. We also know that such agents are usually not trained officers — often they are themselves addicts or former addicts. The Government must know that an eager informer is exposed to temptations to produce as many accuseds as possible at the risk of trapping not merely an unwary criminal but sometimes an unwary innocent as well. One could hardly expect such informants always to stay on the proper side of the line which separates those two cases. And since the Government chooses to utilize such agents, with the attendant risk of entrapment, it is fair to require the Government which uses this inherently dangerous procedure to take appropriate precautions to insure that no [560]*560innocent man should be punished. [Footnote omitted.]
These motivations have their origins in the considerations which impel a man who is essentially “anti-social, or at best anti-police9 to give the authorities his cooperation. Such have been described by agents experienced in this field, as, among others,
The fear motive. * * * [W]e might expect an emotional reaction favorable to our investigative objective, if we have a prospective informer who is afraid of something. This could be fear of any one of many things, or several of them. Our informer might be in fear of the law. This, again, might represent one of many possible conditions. Let us say that he is under arrest, possibly under indictment and facing charges. It is one of the practical facts of law enforcement that under such conditions the accused, looking for sympathy, extenuation, mitigation, or whatever he thinks might improve his lot, is often disposed to give a full account or at least some account of his crimes or those committed by others within his knowledge. He thereby may furnish us with direct evidence against other criminals or show us how such evidence might be obtained. Where such disclosures involve higher-ups or implicate numerous other defendants, this sort of development is very much to the advantage of law enforcement and organized society. It is almost the universal practice of the police, prosecutors and courts to recognize the valuable assistance to law enforcement in this attitude of the informer. This recognition is usually translated in a practical manner as a recommendation for a lesser sentence, a more favorable consideration for parole or probation, the acceptance of a plea to a lesser account in the indictment or through some other favorable action within the discretion of the prosecution.10
That such motivations tend to probity and credibility rather than “to produce as many accuseds as possible” is a highly debatable conclusion. Particularly is this true in view of the circumstances, again relying upon Harney and Cross, as well as our own judicial experience, that “Many of them [informers] are unsavory characters. Some might even be termed despicable * * *.11 Judge Waterman, concurring in part and dissenting in part in United States v. Cimino, 321 F.2d 509, 514 (2nd Cir. 1963), cert. denied, 375 U.S. 967, 84 S.Ct. 486, 11 L.Ed.2d 416 (1964), recognized this problem in a perceptive comment to the effect that:
Seldom can government informers be expected to be pillars of stability in their communities.
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TALBOT SMITH, Senior District Judge.
The petitioner before us was convicted in the Iowa District Court for Black Hawk County of possession of heroin with intent to deliver.1 His conviction was affirmed by the Supreme Court of Iowa.2 Petitioner (hereafter defendant) subsequently brought a petition for writ of habeas corpus,3 denied by the District Court, Northern Division of Iowa, from which denial appeal is taken to this court.
The sole witness to the alleged crime was one Roosevelt Nabors, a/k/a Alvin Banks. Nabors testified that he arranged for, and then witnessed, a sale between defendant and one Glenn “Bub-ba” Phillips.
Nabors, the record discloses, was a professional informant. He has, he testified, “worked throughout the State of Michigan,” in Canada, in New York, and in Ohio. He met with police officers and narcotics agents in Chicago in answer to “a flier out from the State of Iowa, requesting an undercover, and we was answering the flier.” After a conference concerning working in Iowa he proceeded, with agents and his “girl friend” to Waterloo, Iowa. There he was shown pictures of suspects and it was suggested to him that defendant might be one of them. His assigned duties were to become known in black and white neighborhoods, “develop information and, if possible, make purchases, make buys of hard drugs, which is known as heroin.”
His compensation did not depend upon the cases he “made” but covered his living expenses, “food, rent, [and] so forth,” including those of his female companion, the total amounting to some twelve hundred dollars in this case, plus “help” on occasion with the expenses of a car he had obtained. What his local employment arrangements were, besides his un[558]*558dercover work, are not clear from the record, since objection to a question as to the details of Agent (not to be confused with defendant) Johnson’s conceded “dealings” with the informant’s employer was sustained. In addition the informant had opportunity, of which he availed himself, of making a little money on the side. Thus he received $200, unreported to his superiors, for introducing “people [who] wanted to buy some heroin” to “a guy that was in this line of business.”
The principal issue before us concerns his attempted impeachment. He testified that immediately prior to his coming to Iowa he had worked in Muskegon, Michigan, and that his modus operandi, save as to the quantity of heroin bought, there was basically as in Iowa. In Muskegon, he testified, he had made a “buy” from one Matt Durda, Jr., and had so informed the authorities. After more foundational questions defendant then made an offer of proof, set forth in extenso in the margin hereof.4 What he [559]*559offered to prove in substance was that the Muskegon case was a “frame-up”5 by this informant-witness and that the Muskegon County Attorney had accordingly moved the court for dismissal of the charges.6 The offer of proof was rejected by the trial court on the ground that it was immaterial, and a collateral matter, concerning which extrinsic testimony was not admissible. The defendant argues that, under these unique facts, the foreclosure of his defense as to the alleged mendacity of the informant went far beyond mere “error” as to the introduction of evidence but was so gross and decisive as to amount to a deprivation of due process.
We here consider, then, the unique problems presented by the testimony of the paid informer. His employment has been the subject of extensive commentary, little or none of it approbative.7
That his motivation may well be to make good in his employment by producing violators is commonly known. As we stated in United States v. Barnes, 486 F.2d 776, 780 (8th Cir. 1973):8
The practice of the Government in employing agent-informers in narcotics cases is well known. We also know that such agents are usually not trained officers — often they are themselves addicts or former addicts. The Government must know that an eager informer is exposed to temptations to produce as many accuseds as possible at the risk of trapping not merely an unwary criminal but sometimes an unwary innocent as well. One could hardly expect such informants always to stay on the proper side of the line which separates those two cases. And since the Government chooses to utilize such agents, with the attendant risk of entrapment, it is fair to require the Government which uses this inherently dangerous procedure to take appropriate precautions to insure that no [560]*560innocent man should be punished. [Footnote omitted.]
These motivations have their origins in the considerations which impel a man who is essentially “anti-social, or at best anti-police9 to give the authorities his cooperation. Such have been described by agents experienced in this field, as, among others,
The fear motive. * * * [W]e might expect an emotional reaction favorable to our investigative objective, if we have a prospective informer who is afraid of something. This could be fear of any one of many things, or several of them. Our informer might be in fear of the law. This, again, might represent one of many possible conditions. Let us say that he is under arrest, possibly under indictment and facing charges. It is one of the practical facts of law enforcement that under such conditions the accused, looking for sympathy, extenuation, mitigation, or whatever he thinks might improve his lot, is often disposed to give a full account or at least some account of his crimes or those committed by others within his knowledge. He thereby may furnish us with direct evidence against other criminals or show us how such evidence might be obtained. Where such disclosures involve higher-ups or implicate numerous other defendants, this sort of development is very much to the advantage of law enforcement and organized society. It is almost the universal practice of the police, prosecutors and courts to recognize the valuable assistance to law enforcement in this attitude of the informer. This recognition is usually translated in a practical manner as a recommendation for a lesser sentence, a more favorable consideration for parole or probation, the acceptance of a plea to a lesser account in the indictment or through some other favorable action within the discretion of the prosecution.10
That such motivations tend to probity and credibility rather than “to produce as many accuseds as possible” is a highly debatable conclusion. Particularly is this true in view of the circumstances, again relying upon Harney and Cross, as well as our own judicial experience, that “Many of them [informers] are unsavory characters. Some might even be termed despicable * * *.11 Judge Waterman, concurring in part and dissenting in part in United States v. Cimino, 321 F.2d 509, 514 (2nd Cir. 1963), cert. denied, 375 U.S. 967, 84 S.Ct. 486, 11 L.Ed.2d 416 (1964), recognized this problem in a perceptive comment to the effect that:
Seldom can government informers be expected to be pillars of stability in their communities. If the common understanding is to be credited they are often narcotic addicts or petty criminals whose cooperation with law enforcement officials is not entirely voluntary.
If, then, as we so often hear in argument, and as is argued in this case, “unsavory characters” are hired because of sheer necessity, the corollary is clear: that as the mala tides of the government’s agent increase, the care with which he is used, his surveillance by responsible personnel, and his corroboration, become increasingly necessary, lest he pay his way with the coin of conviction by whatever means obtained.
The offer here made was thus to show that the informant before the court and jury was completely insensitive to the obligations of his oath and that from [561]*561motivations the origin of which we can only surmise, but nevertheless apparently existent, he had, as demonstrated in a parallel case, neither compunction nor scruple against “framing” a man. We have difficulty in envisioning a situation responding more completely to the orthodox test of bias, the quality of emotional partiality.12
The only ease we have found on reasonably parallel facts, involving alleged false testimony by an undercover agent is the case of Hutchings v. State, 518 P.2d 767 (Alaska 1974). In this case undercover agent Clements testified that he was introduced to defendant Hutch-ings by another undercover agent, Hof-hines, and that Hutchings sold him, Clements, the drug. Hofhines, however, at the trial, denied that Hutchings was the man she introduced to Clements. The defendant then sought to show upon cross-examination that Clements was a discharged policeman who was motivated by a desire to be reinstated to the force and was seeking to demonstrate both his effectiveness and his help to the prosecution. Objection as to immateriality was sustained. The Supreme Court of Alaska reversed on the ground that undue restriction of investigation of bias was an abuse of discretion which required retrial. The court held that Clements’ hope for reinstatement to the police force could serve as a powerful motive to shade his testimony, either unconsciously or intentionally. The court went on:
There are no special rules of “proper impeachment” for bias. The credibility of witnesses is .always a material issue, so the only question of materiality or relevance when evidence is offered to impeach for bias is whether the evidence tends in reason to demonstrate the existence of some fact, state of mind or condition that a reasonable person would take into account in assessing the credibility of the witness under attack. As we pointed out above, the balance must be weighed in favor of admissibility where impeachment for bias is the object.
518 P.2d at 769.
A recent examination by the United States Supreme Court of the permissible showing of bias is found in Davis v. Alaska, 415 U.S. 308, 94 S.Ct. 1105, 39 L.Ed.2d 347 (1974), a case involving the possible bias of a prosecuting witness deriving from his probationary status as a juvenile delinquent. The Court held that the jury may be afforded “a basis to infer that the witness’ character is such that he would be less likely than the average trustworthy citizen to be truthful in his testimony” and that:
A more particular attack on the witness’ credibility is effected by means of cross-examination directed toward revealing possible biases, prejudices, or ulterior motives of the witness as they may relate directly to issues or personalities in the case at hand. The partiality of a witness is subject to exploration at trial, and is “always relevant as discrediting the witness and affecting the weight of his testimony.” 3A J. Wigmore, Evidence § 940, p. 775 (Chadbourn rev. 1970). We have recognized that the exposure of a witness’ motivation in testifying is a proper and important function of the constitutionally protected right of cross-examination [citation omitted].
415 U.S. at 316-317, 94 S.Ct. at 1110.
Of particular applicability to the matter before us, involving allegedly perjured testimony at a former trial, is the Court’s observation to the effect that
“[A] partiality of mind at some former time may be used as the basis of an argument to the same state at the time of testifying; though the ultimate object is to establish partiality at the time of testifying.” 3A J. Wig-more, Evidence, § 940, p. 776 (Chadb-[562]*562oum rev. 1970). (Emphasis in original; footnotes omitted.)”
415 U.S. at 817 n. 5, 94 S.Ct. at 1111.
We recognize, of course, that the Davis case involved cross-examination whereas the question before us concerns impeachment of matters asserted upon cross. But so far as being “collateral,” or provable by extrinsic testimony, is concerned, it is the universal holding of the authorities that as to bias the cross-examiner is not bound by the answer.13 We are not disposed to forge a new rule upon these facts.
The exclusion of the testimony proffered as to the attempt by the informant-witness, the only witness to the alleged crime, to frame another defendant in a precisely parallel case went beyond a mere error14 in the introduction of evidence. What is actually asserted is governmental conduct which, if true, is both inexplicable,15 and violative of due process.16
[563]*563The essential point is that the jury must be given an opportunity to assess the Michigan incident in whatever manner it wishes. It may, indeed, hurt the defendant, if the jury believes that the informant would be more, rather than less, careful and truthful after being compromised in Michigan. But more importantly, the truth shall never be known if one of the two knowledgeable parties to the alleged sale is immune from reasonable scrutiny of his possible relationship with the government. A jury could reasonably find inter alia several different forms of bias existent in this case, reasoning as follows:
a. The Michigan prosecutor would never rely on Nabors again. He needed work, which means he needed to produce for his new government employer, which may have tempted him to engage in a quick frame to demonstrate his utility.
b. In view of his Michigan experience, Nabors may have feared not only that he would no longer be used by any government as an informant, but also that he might be subject to extensive surveillance. To avoid this, he might do anything to remain in the good graces of some state government (a source of protection).
c. Any informant who would set-up a totally innocent man for conviction of a criminal offense may be so prejudiced against anyone suspected of narcotics dealings that a frame would never seem unjustified to such an informant.
d. Since Nabors indicated that he used the same modus operandi in Michigan as in Iowa, it may be that he has the same financial interest in a frame in Iowa as in Michigan. In other words, in Michigan he tried to divert the funds provided him for the purchase of narcotics to his girlfriend. To do this, he apparently used a frame to cover the diversion. He might have done the same thing in this case.
e. A witness who deliberately lies about commission of criminal acts against the government that pays him must assume that lies are an acceptable means to reach the ends for which he is paid, i. e., convictions, and that he may believe that getting caught in a lie, not lying, was his mistake. The next time he may be harder to catch.
It must be recognized that bias, like almost every other human emotional or mental condition or attitude, is rarely provable beyond all doubt. In Davis v. Alaska, supra, the Supreme Court did not say the witness was biased; it said he might be. This is also the case with Hutchings v. State, supra. But it is equally true that it is generally impossible to be certain whether a witness is 1) truthful, and 2) if truthful, accurate. To assess truthfulness and accuracy, it is necessary at times to sift a witness’ testimony by means of certain legal devices, such as impeachment.
In holding that in a case like this where a government prosecutor confesses in open court that the key prosecution witness has deliberately lied, where this same witness uses an identical modus op-erandi to become the key government witness in another case, where the informant is a career informant dependent on a continuing relationship with the government, where several different forms of bias may exist and may exist simultaneously, the State has an obligation to permit an inquiry into the initial deliberate lie, we do not fear that we strike even a modest blow against reasonable state rules of evidence.
We stress a caveat: We do not, of course, purport to pass upon the truth or falsity of those matters set forth in the offer of proof. But they are not “immaterial,” they are not “collateral,” and the defendant is entitled to put them before the jury. If true, the circumstances of the presentation of this witness to the [564]*564court and jury will, we are satisfied, receive searching inquiry.
The judgment of conviction is vacated. The case is reversed and remanded to the district court with directions to issue the writ of habeas corpus discharging petitioner, subject to the right of the State, if it wishes to do so, to try him on the indictment here involved within 90 days of the time the mandate of this court reaches the district court. Reversed and remanded.