FRIENDLY, Circuit Judge:
This is another case, see United States v. Peterson, 768 F.2d 64 (2 Cir.1985), where the federal narcotics laws have been in[399]*399voked with respect to the New York City Police Department’s Operation Pressure Point in Harlem. Here, as in Peterson, Officer William Grimball, acting under cover as an addict, procured a “joint” of heroin, and a backup team promptly pounced on those thought to have been involved in the sale.
The indictment, in the District Court for the Southern District of New York, contained two counts. Count One charged appellant Ronald Brown and a codefendant, Gregory Valentine, with conspiring to distribute and to possess with intent to distribute heroin in violation of 21 U.S.C. § 846. Count Two charged them with distribution of heroin in violation of 21 U.S.C. §§ 812, 841(a)(1), 841(b)(1)(A), and 18 U.S.C. § 2. After a three day trial, the jury convicted Brown on Count One but was unable to reach a verdict on Count Two.1 After denying, in a written opinion, motions under F.R.Crim.P. 29 and 33 for entry of judgment of acquittal or a new trial, the judge suspended imposition of sentence on Count One and placed Brown on three years’ probation. Count Two was dismissed with the Government’s consent. This appeal followed.
Officer Grimball was the Government’s principal witness. He testified that early in the evening of October 9, 1984, he approached Gregory Valentine on the corner of 115th Street and Eighth Avenue and asked him for a joint of “D”.2 Valentine asked Grimball whom he knew around the street. Grimball asked if Valentine knew Scott. He did not. Brown “came up” and Valentine said, “He wants a joint, but I don’t know him.” Brown looked at Grim-ball and said, “He looks okay to me.” Valentine then said, “Okay. But I am going to leave it somewhere and you [meaning Officer Grimball] can pick it up.” Brown interjected, “You don’t have to do that. Just go and get it for him. He looks all right to me.” After looking again at Grimball, Brown said, “He looks all right to me” and “I will wait right here.”
Valentine then said, “Okay. Come on with me around to the hotel.” Grimball followed him to 300 West 116th Street, where Valentine instructed him, “Sit on the black car and give me a few minutes to go up and get it.” Valentine requested and received $40, which had been prerecorded, and then said, “You are going to take care of me for doing this for you, throw some dollars my way?,” to which Grimball responded, “Yeah.”
Valentine then entered the hotel and shortly returned. The two went back to 115th Street and Eighth Avenue, where Valentine placed a cigarette box on the hood of a blue car. Grimball picked up the cigarette box and found a glassine envelope containing white powder, stipulated to be heroin. Grimball placed $5 of prerecorded buy money in the cigarette box, which he replaced on the hood. Valentine picked up the box and removed the $5. Grimball returned to his car and made a radio transmission to the backup field team that “the buy had went down” and informed them of the locations of the persons involved. Brown and Valentine were arrested. Valentine was found to possess two glassine envelopes of heroin and the $5 of prerecorded money. Brown was in possession of $31 of his own money; no drugs or contraband were found on him. The $40 of marked buy money was not recovered, and no arrests were made at the hotel.
The Government sought to qualify Officer Grimball as an expert on the bases that he had made over 30 street buys of small quantities of cocaine in Harlem, had received two 8V2 hour seminars at the Organized Crime Control Bureau “in respect to street value of drugs, safety, integrity,” had once been assigned to the Manhattan North Narcotics Division where he had informal seminars with undercover detectives experienced in making street buys in the Harlem target area, and had partici[400]*400pated in “ghost operations,” where he as undercover would be placed “on the set” and would observe an experienced undercover detective in an actual buy operation. The judge having ruled him to be qualified as an expert, he testified that the typical drug buy in the Harlem area involved two to five people. As a result of frequent police sweeps, Harlem drug dealers were becoming so cautious that they employed
people who act as steerers and the steer-er’s responsibility is basically to determine whether or not you are actually an addict or a user of heroin and they are also used to screen you to see if there is any possibility of you being a cop looking for a bulge or some indication that would give them that you are not actually an addict. And a lot of the responsibility relies [sic] on them to determine whether or not the drug buy is going to go down or not.
Officer Grimball was then allowed, over a general objection, to testify that based on his experience as an undercover agent he would describe the role that Ronald Brown played in the transaction as that of a steer-er. When asked why, he testified, again over a general objection, “Because I believe that if it wasn’t for his approval, the buy would not have gone down.”
Objections to the Admissibility of Officer Grimball’s Expert Testimony
We deal first with appellant’s contention that all the testimony given by Grimball as an expert should have been excluded because Grimball was unqualified. In reviewing the district court’s decision to treat Grimball as an expert, we note that “the trial judge has broad discretion in the matter of the admission or exclusion of expert evidence, and his action is to be sustained unless manifestly erroneous.” Salem v. United States Lines Co., 370 U.S. 31, 35, 82 S.Ct. 1119, 1122, 8 L.Ed.2d 313 (1962); see also Fernandez v. Chios Shipping Co., 542 F.2d 145, 153 (2 Cir.1976). The decision that Grimball possessed sufficient knowledge and experience was by no means manifestly erroneous. F.R.E. 702, entitled Testimony by Experts, provides:
If scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion or otherwise.
The words “qualified as an expert by knowledge, skill, experience, training, or education” must be read in light of the liberalizing purpose of the Rule, embodied in its introductory clause which has been called “the central concern of Article VII,” see 3 Weinstein’s Evidence 11702[01], at 702-7 (1982), and is further evidenced by F.R.E. 704(a).3
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FRIENDLY, Circuit Judge:
This is another case, see United States v. Peterson, 768 F.2d 64 (2 Cir.1985), where the federal narcotics laws have been in[399]*399voked with respect to the New York City Police Department’s Operation Pressure Point in Harlem. Here, as in Peterson, Officer William Grimball, acting under cover as an addict, procured a “joint” of heroin, and a backup team promptly pounced on those thought to have been involved in the sale.
The indictment, in the District Court for the Southern District of New York, contained two counts. Count One charged appellant Ronald Brown and a codefendant, Gregory Valentine, with conspiring to distribute and to possess with intent to distribute heroin in violation of 21 U.S.C. § 846. Count Two charged them with distribution of heroin in violation of 21 U.S.C. §§ 812, 841(a)(1), 841(b)(1)(A), and 18 U.S.C. § 2. After a three day trial, the jury convicted Brown on Count One but was unable to reach a verdict on Count Two.1 After denying, in a written opinion, motions under F.R.Crim.P. 29 and 33 for entry of judgment of acquittal or a new trial, the judge suspended imposition of sentence on Count One and placed Brown on three years’ probation. Count Two was dismissed with the Government’s consent. This appeal followed.
Officer Grimball was the Government’s principal witness. He testified that early in the evening of October 9, 1984, he approached Gregory Valentine on the corner of 115th Street and Eighth Avenue and asked him for a joint of “D”.2 Valentine asked Grimball whom he knew around the street. Grimball asked if Valentine knew Scott. He did not. Brown “came up” and Valentine said, “He wants a joint, but I don’t know him.” Brown looked at Grim-ball and said, “He looks okay to me.” Valentine then said, “Okay. But I am going to leave it somewhere and you [meaning Officer Grimball] can pick it up.” Brown interjected, “You don’t have to do that. Just go and get it for him. He looks all right to me.” After looking again at Grimball, Brown said, “He looks all right to me” and “I will wait right here.”
Valentine then said, “Okay. Come on with me around to the hotel.” Grimball followed him to 300 West 116th Street, where Valentine instructed him, “Sit on the black car and give me a few minutes to go up and get it.” Valentine requested and received $40, which had been prerecorded, and then said, “You are going to take care of me for doing this for you, throw some dollars my way?,” to which Grimball responded, “Yeah.”
Valentine then entered the hotel and shortly returned. The two went back to 115th Street and Eighth Avenue, where Valentine placed a cigarette box on the hood of a blue car. Grimball picked up the cigarette box and found a glassine envelope containing white powder, stipulated to be heroin. Grimball placed $5 of prerecorded buy money in the cigarette box, which he replaced on the hood. Valentine picked up the box and removed the $5. Grimball returned to his car and made a radio transmission to the backup field team that “the buy had went down” and informed them of the locations of the persons involved. Brown and Valentine were arrested. Valentine was found to possess two glassine envelopes of heroin and the $5 of prerecorded money. Brown was in possession of $31 of his own money; no drugs or contraband were found on him. The $40 of marked buy money was not recovered, and no arrests were made at the hotel.
The Government sought to qualify Officer Grimball as an expert on the bases that he had made over 30 street buys of small quantities of cocaine in Harlem, had received two 8V2 hour seminars at the Organized Crime Control Bureau “in respect to street value of drugs, safety, integrity,” had once been assigned to the Manhattan North Narcotics Division where he had informal seminars with undercover detectives experienced in making street buys in the Harlem target area, and had partici[400]*400pated in “ghost operations,” where he as undercover would be placed “on the set” and would observe an experienced undercover detective in an actual buy operation. The judge having ruled him to be qualified as an expert, he testified that the typical drug buy in the Harlem area involved two to five people. As a result of frequent police sweeps, Harlem drug dealers were becoming so cautious that they employed
people who act as steerers and the steer-er’s responsibility is basically to determine whether or not you are actually an addict or a user of heroin and they are also used to screen you to see if there is any possibility of you being a cop looking for a bulge or some indication that would give them that you are not actually an addict. And a lot of the responsibility relies [sic] on them to determine whether or not the drug buy is going to go down or not.
Officer Grimball was then allowed, over a general objection, to testify that based on his experience as an undercover agent he would describe the role that Ronald Brown played in the transaction as that of a steer-er. When asked why, he testified, again over a general objection, “Because I believe that if it wasn’t for his approval, the buy would not have gone down.”
Objections to the Admissibility of Officer Grimball’s Expert Testimony
We deal first with appellant’s contention that all the testimony given by Grimball as an expert should have been excluded because Grimball was unqualified. In reviewing the district court’s decision to treat Grimball as an expert, we note that “the trial judge has broad discretion in the matter of the admission or exclusion of expert evidence, and his action is to be sustained unless manifestly erroneous.” Salem v. United States Lines Co., 370 U.S. 31, 35, 82 S.Ct. 1119, 1122, 8 L.Ed.2d 313 (1962); see also Fernandez v. Chios Shipping Co., 542 F.2d 145, 153 (2 Cir.1976). The decision that Grimball possessed sufficient knowledge and experience was by no means manifestly erroneous. F.R.E. 702, entitled Testimony by Experts, provides:
If scientific, technical, or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion or otherwise.
The words “qualified as an expert by knowledge, skill, experience, training, or education” must be read in light of the liberalizing purpose of the Rule, embodied in its introductory clause which has been called “the central concern of Article VII,” see 3 Weinstein’s Evidence 11702[01], at 702-7 (1982), and is further evidenced by F.R.E. 704(a).3 While Grimball was scarcely a Chief Superintendent Maigret, he knew a good deal more about street narcotics deals in Harlem than did the jurors, who would consequently be “assisted” by his description of the terms and practices generally used in such sales. For that reason we cannot characterize as “manifestly erroneous” the judge’s conclusion that testimony from Grimball that street drug sales in Harlem generally involved the use of a steerer, at least after the inauguration of Operation Pressure Point, would “assist the trier of the fact to understand the evidence or to determine a fact in issue.” See Ladd, Expert Testimony, 5 Vand.L.Rev. 414, 418 (1952), quoted in F.R.E. 702 Advisory Committee Note.
The admission of Grimball’s opinion testimony that Brown was fulfilling the role of a steerer raises a closer question. We recognize that Rule 704(a), quoted in note 3 supra, abolished the antiquated rule, more frequently honored in the breach than the observance, excluding expert testimony “because it embraces an ultimate issue to be decided by the trier of [401]*401fact.”4 However, there is something rather offensive in allowing an investigating officer to testify not simply that a certain pattern of conduct is often found in narcotics cases, leaving it for the jury to determine whether the defendant’s conduct fits the pattern, but also that such conduct fitted that pattern, at least when other inferences5 could have been drawn not unreasonably although perhaps not as reasonably as that to which the expert testified. Grimball’s testimony casting Brown in the role of a steerer comes close to, although it is not within, F.R.E. 704(b), which provides:
No expert witness testifying with respect to the mental state or condition of a defendant in a criminal case may state an opinion or inference as to whether the defendant did or did not have the mental state or condition constituting an element of the crime charged or of a defense thereto. Such ultimate issues are matters for the trier of fact alone.
Even though the testimony is not barred by F.R.E. 704(b), district judges should heed the Advisory Committee’s Note to Rule 704:
The abolition of the ultimate issue rule does not lower the bars so as to admit all opinions. Under Rules 701 and 702, opinions must be helpful to the trier of fact, and Rule 403 provides for exclusion of evidence which wastes time. These provisions afford ample assurances against the admission of opinions which would merely tell the jury what result to reach, somewhat in the manner of the oath-helpers of an earlier day.
We would thus agree with Judge Newman’s precautionary observations about the admission of such testimony in United, States v. Young, 745 F.2d 733, 765-66 (2 Cir.1984) (Newman, J., concurring), cert. denied, - U.S. -, 105 S.Ct. 1842, 85 L.Ed. 2d 142 (1985), which we quote in the margin,6 and commend this for consideration by district judges.
However, in United States v. Carson, 702 F.2d 351, 369 (2 Cir.), cert. denied, 462 U.S. 1108, 103 S.Ct. 2456, 77 L.Ed.2d 1335 (1983), this court refused to reverse because of the admission of testimony of investigating officers, in that case with an aggregate of 20 years’ experience, that the ambiguous, furtive conduct they had seen undertaken by the defendant was in fact the sale of narcotics. This was true also in United States v. Young, supra, 745 F.2d at 744, 752-53, 760, where a police detective was permitted, after testifying about certain events that he had observed, to testify further “as an expert ‘that it was a narcotics transaction that took place.’ ” While United States v. Sette, 334 F.2d 267, 269 (2 Cir.1964), decided before adoption of the Federal Rules of Evidence, reversed a conviction based primarily on the opinion testimony of investigating officers that the defendant had committed the offense, the [402]*402court did not state that such evidence was inadmissible, but rather that it could not be used to establish a prima facie case against a defendant where the rest of the government’s evidence was insufficient. Because, as we discuss below, there was insufficient evidence here to support Brown’s conviction even without Grimball’s expert opinion testimony, Sette is inapposite. See infra note 9. We must therefore reject the claim of error in admitting Officer Grimball’s testimony that Brown was a steerer.7
Sufficiency of the Evidence
In considering the sufficiency of the evidence, we begin with some preliminary observations. One is that, in testing sufficiency, “the relevant question is whether, after viewing the evidence in the light most favorable to the prosecution, any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.” Jackson v. Virginia, 443 U.S. 307, 319, 99 S.Ct. 2781, 2789, 61 L.Ed.2d 560 (1979) (emphasis in original). The Court also approved, 443 U.S. at 318 n. 11, 99 S.Ct. at 2788 n. 11, our formulation in United States v. Taylor, 464 F.2d 240, 243 (2 Cir.1972), which included the language, borrowed from Judge Prettyman’s opinion in Curley v. United States, 160 F.2d 229, 232-33 (D.C.Cir.), cert. denied, 331 U.S. 837, 67 S.Ct. 1512, 91 L.Ed. 1850 (1947), that if reasonable jurors must necessarily have a reasonable doubt as to guilt, the judge must direct a verdict of acquittal. We repeat these familiar quotations because the beyond a reasonable doubt element tends to become blurred by the Government’s standard reliance on language in Glasser v. United States, 315 U.S. 60, 80, 62 S.Ct. 457, 469, 86 L.Ed. 680 (1942) (“The verdict of a jury must be sustained if there is substantial evidence, taking the view most favorable to the Government, to support it.”). Still Jackson’s emphasis on “any,” while surely not going so far as to excise “rational,” must be taken as an admonition to appellate judges not to reverse convictions because they would not have found the elements of the crime to have been proved beyond a reasonable doubt when other rational beings might do so.
The second observation is that since the jury convicted on the conspiracy count alone, the evidence must permit a reasonable juror to be convinced beyond a reasonable doubt not simply that Brown had aided and abetted the drug sale but that he had agreed to do so. United States v. Borelli, 336 F.2d 376, 384 (2 Cir.1964), cert. denied, 379 U.S. 960, 85 S.Ct. 647, 13 L.Ed.2d 555 (1965). On the other hand, the jury’s failure to agree on the aiding and abetting charge does not operate against the Government; even an acquittal on that count would not have done so. Dunn v. United States, 284 U.S. 390, 52 S.Ct. 189, 76 L.Ed. 356 (1932) (Holmes, J.); Steckler v. United States, 7 F.2d 59, 60 (2 Cir.192,5) (L. Hand, J.); United States v. Carbone, 378 F.2d 420 (2 Cir.), cert. denied, 389 U.S. 914, 88 S.Ct. 242, 19 L.Ed.2d 262 (1967).8
A review of the evidence against Brown convinces us that it was sufficient, even without Grimball’s characterization of Brown as a steerer, although barely so.9 [403]*403Although Brown’s mere presence at the scene of the crime and his knowledge that a crime was being committed would not have been sufficient to establish Brown’s knowing participation in the conspiracy, United States v. Soto, 716 F.2d 989, 991 (2 Cir.1983); United States v. Gaviria, 740 F.2d 174, 184 (2 Cir.1984), the proof went considerably beyond that. Brown was not simply standing around while the exchanges between Officer Grimball and Valentine occurred. He came on the scene shortly after these began and Valentine immediately explained the situation to him. Brown then conferred his seal of approval on Grimball, a most unlikely event unless there was an established relationship between Brown and Valentine. Finally, Brown took upon himself the serious responsibility of telling Valentine to desist from his plan to reduce the risks by not handing the heroin directly to Grimball. A rational mind could take this as bespeaking the existence of an agreement whereby Brown was to have the authority to command, or at least to persuade. Brown’s remark, “Just go and get it for him,” permits inferences that Brown knew where the heroin was to be gotten, that he knew that Valentine knew this, and that Brown and Valentine had engaged in such a transaction before.
The mere fact that these inferences were not ineluctable does not mean that they were insufficient to convince a reasonable juror beyond a reasonable doubt. Moreover, as we said in United States v. Geaney, 417 F.2d 1116, 1121 (2 Cir.1969), cert. denied, 397 U.S. 1028, 90 S.Ct. 1276, 25 L.Ed.2d 539 (1970), “pieces of evidence must be viewed not in isolation but in conjunction.” See also United States v. Monica, 295 F.2d 400, 401-02 (2 Cir.1961), cert. denied, 368 U.S. 953, 82 S.Ct. 395, 7 L.Ed.2d 386 (1962); United States v. Stanchich, 550 F.2d 1294, 1300 (2 Cir.1977). When we add to the inferences that can be reasonably drawn from the facts to which Grimball testified the portion of his expert testimony about the use of steerers in street sales of narcotics, which was clearly unobjectionable once Grimball’s qualifications were established, we conclude that the Government offered sufficient evidence, apart from Grimball’s opinion that Brown was a steerer, for a reasonable juror to be satisfied beyond a reasonable doubt not only that Brown had acted as a steerer but that he had agreed to do so.10
Affirmed.