Lloyd Stanley Walton appeals from his conviction following a jury trial on all four counts of an indictment charging violations of the narcotics and tax laws.

There were two alleged transactions, one occurring about noon on September 20, 1967, at the bar of the Cottage Restaurant, at Fifteenth and Madison in Seattle, Washington, and the other about 8:30 that evening at the same place. The first transaction pertained to the alleged sale by defendant, to an undercover agent of the Federal Bureau of Narcotics, of .431 grams of heroin in violation of 21 U.S.C. § 174 (1964), and section 4704(a) of the Internal Revenue Code of 1954, as amended, 26 U.S.C. § 4704 (a) (1964). The second transaction related to the alleged sale by defendant, to the same undercover agent, of .924 grams of heroin, in violation of the same statutes.

The evidence received at the trial, considered in the light most favorable to the Government, warranted the jury in finding as follows: at 11:30 a. m. on September 20, 1967, Joseph V. Ferro, Acting District Supervisor of the Federal Bureau of Narcotics in Seattle, received a telephone call from Julius Bishop, an informant. Bishop told Ferro that Bishop was then in the company of a seaman named “Stan,” who had narcotics for sale. Ferro then arranged for Bishop to introduce Narcotic Agent Aubrey Abbey to Stan at noon on that day, at the Cottage Restaurant, as a prospective customer.

Abbey entered the restaurant at approximately 12:10 p. m. and joined Bishop and defendant on stools at the counter, at which time Bishop introduced Abbey to defendant. After a brief conversation between Abbey and defendant, in which Bishop took no part, defendant offered to sell a spoon of heroin to Abbey for $75.00. Defendant then handed Abbey a paper bindle containing narcotics.

After testing the narcotics in the restaurant washroom, Abbey paid defendant $75.00 from Government advance funds. Defendant then offered to sell Abbey more narcotics and they agreed to meet at the same place at 8:00 p. m. that evening to complete a similar transaction. Agent Ferro and Seattle Police Officer Richard B. Kurttila, seated only a few feet away, witnessed the transaction, including the exchange of narcotics and currency, but could not hear the conversation.

The second sale by defendant to Abbey was consummated at the same place about 8:30 p. m. that evening. Bishop was not present for this second transaction. Agent Ferro, Officer Kurttila and Seattle Police Officer William Henaby, saw Abbey and defendant together in the restaurant but were not close enough to witness the second transaction.

Defendant’s sole defense was that of entrapment. His counsel told the jury in his opening statement that defendant would not deny that the transactions occurred. Defendant himself testified that he engaged in the two transactions.

On this appeal defendant first argues that he was not afforded a speedy trial as guaranteed by the Sixth Amendment. Defendant’s argument with regard to delay may also possibly be read as invoking the Due Process Clause of the Fifth Amendment.

Insofar as the Sixth Amendment guarantee of a speedy trial is concerned, the delay in question was for the slightly more than four months between November 14, 1967, when a formal charge in the form of a secret indictment was lodged against him, and March 18,1968, when the trial commenced. See Benson v. United States, 9 Cir., 402 F.2d 576 ; Lucas v. United States, 9 Cir., 363 F.2d 500, 502 . Insofar as the Due Process Clause precludes unreasonable delays (see Woody v. *286 United States, 125 U.S.App.D.C. 192 , 370 F.2d 214 ) the critical time span is the almost six months’ period between September 20, 1967, when defendant could have been arrested, and March 18, 1968.

Defendant does not assert that the charges against him are barred by the statute of limitations. This being the case, it was incumbent upon defendant promptly to assert, in the trial court, any claim that he was being deprived of his Sixth Amendment right to a speedy trial. Defendant made no such claim in the district court with regard to the speedy trial guarantee and therefore may not obtain relief on that ground in this court. See Benson v. United States, supra.

Concerning the due process aspect of the delay, defendant did not, in the district court, seek dismissal of the action, but contended only that the delay contributed to the inability of the Government to produce the informant, Julius Bishop, as a witness. We will therefore consider the due process aspect of the delay problem in discussing defendant’s second contention on this appeal. That contention is that he was deprived of a fair trial, and therefore of due process of law under the Fifth Amendment, because the Government was unable to produce the informant, Julius Bishop, as a witness. 1 Defendant asserts that Bishop would have corroborated his contention that he was entrapped.

The Government did not arrest defendant on September 20, 1967, because enforcement officers hoped that, by keeping him under surveillance for a period of time, the latter’s source of supply could be discovered and cut off. The Government’s expectations in this regard were predicated mainly upon agent Abbey’s report of the conversation he had with defendant at the time of the second heroin transaction on September 20,1967.

As testified to by Abbey (but in substance denied by defendant), defendant told Abbey that the heroin he sold to Abbey at noon on September 20, 1967, came from Hong Kong. According to Abbey, defendant said that the heroin involved in the second sale on that day came from Inchon, Korea. Abbey testified that defendant, who was a seaman, told him that he planned to return to the sea on September 23, 1967, and that he was bringing additional narcotics into the country. Defendant agreed to deliver to Abbey, upon his return, a large quantity of narcotics.

According to Abbey’s testimony, defendant also advised him that defendant had been successfully peddling narcotics for the last sixteen years while he was a seaman. Abbey testified that defendant told him that his procedure in selling narcotics was as follows: he brought the narcotics into the country from the Far East aboard ship. Upon arriving in the United States, defendant would go to his home in Portland, Oregon, pick up his Cadillac, journey down the coast, and pick up his heroin which had been taken off the ship for him by others. He would then make deliveries to his customers.

On the basis of this information and arrangement, Abbey’s office determined to postpone defendant’s arrest. This was done so that, pursuant to a cooperative arrangement with the United States Bureau of Customs, an effort could be made to identify defendant’s foreign sources of supply. It was expected that this could be accomplished with the assistance of the Federal Bureau of Narcotics’ agents in Bangkok, Hong Kong and Seoul.

While, according to Abbey, defendant expected to ship out on September 23, 1967, defendant testified that he did not do so until October of that year. The federal enforcement officials thereafter maintained enough surveillance to learn that defendant was aboard the S. S. BUCKNELL VICTORY when it docked *287 at San Francisco shortly before the middle of December, 1967. Arrangements had been made between the federal agencies to permit defendant to leave the ship with a cursory search, but defendant apparently left the ship before any search of his person was made, free and clear of immediate surveillance.

Defendant reached Seattle about De> cember 14, 1967. The Federal Bureau of Narcotics soon thereafter verified this fact. Abbey, acting in an undercover capacity, tried on several occasions to contact defendant through the telephone number defendant had supplied, but was unsuccessful. Therefore, on January 31, 1968, it was decided to terminate the investigation and arrest defendant. It required some careful detective work to track down defendant’s whereabouts, but this was accomplished and the arrest was made on February 1,1968.

Prior to the trial, the district court granted defendant’s motion that the Government be ordered to make known the name and address of the informant. The Government complied with the order. 2 However, the informant, Julius Bishop, could not be found at the address.

The Government advised the court and defendant that if any information concerning Bishop’s whereabouts came to the attention of law enforcement officers, it would be immediately conveyed to the defendant and the court. No such information was obtained. Defendant then sought and obtained orders authorizing the use of Government funds to employ an investigator in an attempt to locate Bishop and also authorizing issuance of a subpoena for Bishop’s appearance at the trial. An investigator was employed but neither he nor the United States Marshal’s office could find Bishop.

The defendant then moved that the Government be ordered to produce Bishop as a witness. This motion was denied. However, upon the demand of the court, the statements made by Bishop to the narcotics agents concerning the September 20, 1967 transactions were read to the court and shown to counsel for defendant prior to the trial. The informant’s statements corroborated the testimony of the Government witness summarized at the outset of this opinion. In his opening brief on appeal defendant concedes that these statements were not helpful to defendant. 3 He also makes it clear that the defendant does not contend that the Government was suppressing information concerning Bishop’s whereabouts.

The circumstances described above, especially defendant’s concession last referred to, establish that this is not a case for application of the rule that a fair trial is denied where the prosecution suppresses material evidence favorable to an accused, irrespective of the good or bad faith of the prosecution. 4

The question remains whether the unavailability of the informant deprived defendant of the fair trial contemplated by the Due Process Clause of the Fifth Amendment. While defendant also invokes the Sixth Amendment right to be confronted by the witnesses against him, we think our consideration of the fair *288 trial problem will also be dispositive of this Sixth Amendment claim. 5

We must initially recognize that an informant stands in a position different from that of an ordinary witness whose testimony may be material because he just happened upon the scene. Bishop was purposely used by the Government to obtain evidence, and the Government must therefore assume greater responsibility for producing him as a witness than would be the case with an ordinary witness. Moreover, we must also consider the circumstance that the Government’s delay in arresting defendant, however justified, may have contributed to its later inability to produce Bishop as a witness.

These two factors east the question as one of whether defendant had a fair trial, for ordinarily a conviction is not to be reversed solely because an accused could not find a material witness. And since the ultimate inquiry is whether defendant had a fair trial, the controlling consideration is whether there is a reasonable possibility that, if Bishop had been available to testify, defendant would not have been convicted.

As indicated above, defendant conceded that he participated in the two narcotic drug sales which occurred on September 20, 1967. His only defense was entrapment. Entrapment is shown where Government agents go beyond the mere affording of opportunities or facilities for the commission of the offense and exert persuasion or pressure of one kind or another which induces the commission of a crime by one who had no predisposition to do so. 6

The record is undisputed that the Government presented its agent, Abbey, as a prospective narcotics customer and arranged to have him introduced to defendant. It is therefore apparent that the Government agents afforded defendant opportunities for the commission of the offenses in question. But, as indicated above, entrapment did not occur unless the Government effort went beyond this and, by means of persuasion or pressure, induced defendant to commit the offenses even though he had no predisposition to do so. The had the burden of proving, beyond a reasonable doubt, that no such persuasion or pressure was exerted. 7

There was ample evidence to support the implicit jury finding that the Government agents did not exert persuasion or pressure of any kind in an effort to induce defendant to commit the offenses. Walton does not contend otherwise. Instead, he argues, in effect, that if Bishop had been available to testify, there is a reasonable possibility that the jury would not have found beyond a reasonable doubt, that the Government agents did not engage in such persuasive efforts.

We do not agree. Defendant’s own testimony established that the Government agents did not go beyond the mere affording of opportunities or facilities for the commission of the offenses. This being the case, there is no reasonable possibility that Bishop’s testimony either as to the scope of the Government’s *289 effort to involve defendant in a narcotics transaction or as to defendant’s predisposition to commit offenses of that kind would have led to an implicit jury-finding that defendant was entrapped.

Defendant testified at length concerning the two transactions of September 20, 1967. He did not testify that Bishop came to him and talked him into making a sale to some customer Bishop had in mind. According to defendant, all that Bishop initially did was to come to him in a Seattle bar and ask defendant if he had any “stuff,” meaning heroin. Defendant testified that he answered “no,” and that ended the initial contact between the two.

Defendant testified that the next episode did not involve Bishop nor anyone else alleged to have been connected with the Government. His testimony was that, a short time after the above-described exchange between him and Bishop, a seaman whom defendant had seen in Vietnam approached defendant in the bar and said he had some “stuff.” Defendant further testified that, armed with this information from the seaman, he went to Bishop, still in the bar, and reported what the seaman had told defendant.

According to defendant, Bishop and the seaman then made a “deal” which contemplated that the seaman would obtain some heroin and hand it to defendant. Defendant would then go with Bishop to another place where defendant would give the heroin to Bishop, and the latter would sell it to a third party. Defendant testified that he was to receive twenty-five dollars for his part in the transaction. He further testified that, pursuant to this deal, the seaman left, presumably to get the narcotics, and Bishop made a telephone call, presumably to Agent Ferro, as described above.

According to defendant, the seaman and Bishop then returned to the bar and the seaman gave defendant a package containing heroin. Defendant testified that he and Bishop then drove in defendant’s car to the Cottage Restaurant. About ten minutes later Abbey, whom defendant did not know, arrived. Bishop and Abbey carried on a brief conversation. According to defendant, Bishop then gave him assurances to the effect that Abbey was a legitimate customer.

Bishop introduced Abbey to defendant but declined to personally make the sale to Abbey. So, as defendant testified, there was “nothing else I could do, so I give [sic] it to him * * meaning that he gave Abbey the package of heroin. According to defendant, Abbey gave defendant seventy-five dollars. Defendant testified that he told Abbey that he did not know whether the heroin was good “because it didn’t belong to me, * * *» rather to the seaman. Defendant testified that he met the seaman at a bar about 2:00 p. m., and “I give [sic] him his money.”

As to the second transaction, which occurred that same evening, defendant testified that after giving the proceeds of the first transaction to the seaman, the latter gave him another package of heroin. Defendant later went to his home and went to bed. About 8:00 o’clock in the evening Abbey telephoned to him and reminded defendant that the latter was supposed to meet Abbey at the Cottage Restaurant at that time. Defendant dressed and went to the restaurant where he met Abbey. Bishop was not present. Defendant gave Abbey the second package of heroin, and told Abbey that he “didn’t know for sure what it was, but for him to test it.” Abbey went to the washroom and tested it for purity, and thereafter paid money to defendant. They had a few drinks together and then left the restaurant.

The lack of any effort by the Government to persuade defendant to engage in narcotics sales is thus revealed by his own testimony. Without any persuasion on the part of Bishop he was ready to facilitate a transaction between Bishop and the seaman. 8 He was willing to par *290 ticipate therein for a consideration of twenty-five dollars. He exhibited the customary misgivings characteristic of narcotics peddlers when introduced to new prospective customers. He knew that heroin might or might not be “good,” and was not surprised when Abbey took it to the restaurant washroom to make a test. In fact he suggested that Abbey test the second package of heroin. He noticed, and was surprised, as any experienced narcotics peddler would be, when Abbey did not use a newspaper to hide the exchange of narcotics and currency.

Moreover, during the course of his testimony, defendant used, or demonstrated his understanding of, the narcotics jargon used by experienced traffickers. Such terms as “stuff,” “spoon,” and “bindle” were familiar to him. 9

We therefore conclude that whether or not defendant was predisposed to commit offenses of the kind here in question, he has established by his own testimony that the Government did not entrap him.

It is true that, at the trial, the Government countered the entrapment defense not only by evidence that it made no effort to persuade defendant to commit the offenses, but by evidence that defendant was predisposed to commit such offenses. In this connection, the Government relied in part upon the testimony of Agent Ferro to the effect that Bishop told him that defendant was a narcotics trafficker. 10 Defendant argues here, in effect, that there is a reasonable possibility that Bishop, if available, would have given probative testimony to the effect that he did not so advise the agents, or that he would have given other testimony tending to show that defendant did not have a predisposition of the kind in question.

We consider this contention notwithstanding the conclusion stated above that the jury did not need to reach the question of predisposition, since we cannot be sure that it did not consider that issue. However, in view of all of the circumstances related above, we do not believe that there is a reasonable possibility that Bishop, if available, would have given probative testimony to the effect that he did not so advise the agents, or that he would have given other testimony tending to show that defendant did not have a predisposition of the kind in question. 11

Defendant’s third and final contention on appeal is that the trial court erred in failing to strike the hearsay testimony of Agents Ferro and Abbey as to what Bishop and other informants told them concerning defendant’s predisposition to traffic in narcotics.

When Agent Ferro was first asked, on rebuttal, whether he had received information concerning the propensity of defendant to commit such offenses, counsel for defendant objected on the ground that the question called for a conclusion of the witness. This objection was sustained. Ferro was then asked a series of questions which produced testimony to the effect that Bishop and another informant had told him that defendant was supplying narcotics to peddlers in Seattle. *291 Counsel for defendant offered no objection to this line of questioning.

After this testimony by Ferro had been fully developed, the prosecutor asked Ferro whether Bishop said anything to him as to whether the “Stan” referred to by Bishop was the same “Stan” that Bishop had referred to in previous conversations with Ferro during the summer of 1967. After Ferro answered “Yes,” counsel for defendant, for the first time objected on the ground that the question called for hearsay. Counsel did not move to strike any of the previous testimony Ferro had given, as described above. The objection was overruled. When Abbey was thereafter led over the same line of inquiry, counsel for defendant offered no objection.

While this whole series of questions asked of Ferro and Abbey called for hearsay testimony and was not admissible under any exception to the hearsay rule, 12 the point was not sufficiently preserved to entitle defendant to raise the question here.

Moreover, defendant was not aggrieved by the admission of this hearsay because counsel for defendant had already, on his initial cross examination, elicited similar hearsay. Counsel for defendant asked Abbey how long he had considered defendant a narcotics suspect. Abbey replied, “We had received information regarding him for approximately, maybe four months prior.” Later, on the same cross examination, counsel asked Abbey what records he had indicating or leading Abbey to suspect that defendant was in the narcotics trade. Abbey replied, in effect, that an informant in the Seattle area, other than Bishop, had told him that “Stan” was at sea and would bring narcotics on his return to this country. 13

Likewise, when Ferro was under initial cross examination, prior to his recall as a rebuttal witness, counsel for defendant asked him where he learned that defendant was dealing with other parties in the area. Ferro replied, “From other informants.” Counsel for defendant then continued this line of cross examination and drew from Ferro the testimony that he “had information” for several months concerning defendant’s other narcotics activity in the area. Counsel for defendant did not express surprise in obtaining hearsay answers to his questions asked of Abbey and Ferro on cross examination, nor did he seek to strike the hearsay his own questions brought forth.

We accordingly hold that the reception of the described hearsay, received during the rebuttal testimony of Abbey and Fer-ro, was not reversible error.

Affirmed.

*292 ORDER

The petition for rehearing is denied.

. If, in fact, defendant intends to argue that, apart from the relationship between the delay and the inability of the Government to produce the informant as a witness, the delay constituted a denial of due process, his failure to so urge in the district court precludes relief here under the rule applied in Benson, supra.

. We therefore have no problem here concerning the so-called “informer’s privilege.” See Roviaro v. United States, 353 U.S. 53 , 77 S.Ct. 623 , 1 L.Ed.2d 639 ; McCray v. Illinois, 386 U.S. 300 , 87 S.Ct. 1056 , 18 L.Ed.2d 62 .

. In his opening brief on appeal defendant also states:

. The rule is stated and applied in Brady v. Maryland, 373 U.S. 83, 87 , 83 S.Ct. 1194 , 10 L.Ed.2d 215 . See also, Lee v. United States, 9 Cir., 388 F.2d 737, 738 ; Thomas v. United States, 9 Cir., 343 F.2d 49, 53-54 .

. No decision has been called to our attention in which, without regard to whether the defendant was prejudiced, the Government’s inability to produce an informant as a witness has been held to deprive the defendant of the right to confront the witnesses against him. Quite to the contrary, where there has been no showing of prejudice, the rule appears to be that this Sixth Amendment right has not been violated. See, for example, McCray v. Illinois, 386 U.S. 300, 313-314 , 87 S.Ct. 1056 , 18 L.Ed.2d 62 ; D’Ercole v. United States, 2 Cir., 361 F.2d 211, 212 ; Dear Check Quong v. United States, 82 U.S. App.D.C. 8, 160 F.2d 251, 253 .

. See Sherman v. United States, 356 U.S. 369, 372 , 78 S.Ct. 819 , 2 L.Ed.2d 848 ; Sorrells v. United States, 287 U.S. 435, 442 , 53 S.Ct. 210 , 77 L.Ed. 413 ; Nordeste v. United States, 9 Cir,, 393 F.2d 335, 338 .

. Robison v. United States, 9 Cir., 379 F. 2d 338, 345 ; Notaro v. United States, 9 Cir., 363 F.2d 169, 175 .

. In this connection see Masciale v. United States, 356 U.S. 386 , 78 S.Ct. 827 , 2 L.Ed. 2d 859 , where the Court said: “It is noteworthy that nowhere in his testimony did *290 petitioner state that during the conversation either [Government agents] * * * tried to persuade him to enter the narcotics traffic.” 356 U.S. at 387-388, 78 S.Ct. at 828.

. Upon being asked where he learned the meaning of “spoon,” defendant testified, “From the seaman. He told me he had two spoons.”

. Agent Ferro testified that he received this information concerning defendant’s propensity from Bishop and another unnamed informant. Agent Abbey testified that he received information to his effect from “Owl Face” Larry Johnson, no mention being made of Bishop.

. There are also additional circumstances supporting this conclusion. We know that Bishop arranged for the meeting between Abbey and defendant which actually occurred. He could hardly have arranged this without knowing of defendant’s background. We also know that if Bishop had testified contrary to the information Fer-ro said Bishop had given him concerning defendant’s predisposition, he would have been confronted with his written statements which corroborated Ferro’s testimony in this regard.

. The trial court overruled the objection on the ground that the inquiry was whether the officers had reasonable grounds to believe defendant had a predisposition to traffic in narcotics. The court reasoned therefrom that Ferro’s testimony as to what Bishop told him concerning defendant’s propensity was intended only to demonstrate what advice they had received from a reliable informant and not to establish the truth of what Bishop told Ferro. If this were true, the testimony would not bo hearsay.

There is language in at least one decision of this court tending to support the view that the critical predisposition inquiry is whether the officers had reasonable grounds to believe the accused had a predisposition to commit offenses of this kind. See Trice v. United States, 9 Cir., 211 F.2d 513, 516 . The more recent entrapment decisions, however, in holding that the burden of proof to negate entraptrapment is on the Government, establish that the critical issue on the predisposition facet of that defense is not whether the officers who induced the accused had reasonable grounds to believe he had such a propensity, but whether he did, in fact, have such a propensity. See Robison v. United States, 9 Cir., 379 F.2d 338, 345 ; Notaro v. United States, 9 Cir., 363 F.2d 169, 175 .

. Similarly, after Abbey had been recalled by the Government for rebuttal testimony and was under cross examination by counsel for defendant, the latter drew from xlbbey the testimony that, during a conversation with a trafficker named Owl Face Larry Johnson, Johnson told Abbey that defendant would sell narcotics.