Opinion for the Court filed by Circuit Judge WALD.
Yonatan Teffera challenges the sufficiency of the evidence produced at trial to support his conviction for possession with intent to distribute cocaine base in violation of 21 U.S.C. § 841(a)(1). More specifically, Teffera contends that there was insufficient evidence to sustain a finding that he either constructively possessed the drugs in question or aided and abetted their possession. We agree and, accordingly, reverse his conviction. 1
I. Facts
At approximately 11:15 p.m. on November 4, 1990, Special Agent Gerald Crispino observed appellant Teffera get off the # 1645 bus from New York at the Greyhound/Trailways bus terminal in Washington. Teffera was accompanied by another individual, later identified as Thomas Cobb. Agent Crispino, suspecting that the two men might be carrying drugs, alerted his partner, Detective Vance Beard, to their presence. Detective Beard’s attention, however, focused initially on a woman who arrived on the same bus. After interviewing her, Detective Beard saw Teffera standing alone near the taxi stand on First Street just outside the station. Detective Beard approached Teffera, identified himself, and asked if he could speak to him. Teffera agreed to talk, and, in response to Beard’s inquiries, identified himself as Tony Johnson and said that he lived in Washington but had been in New York for several days. Teffera also told Beard that he was travelling alone and that he was going to visit an uncle who lived on Columbia Road in Washington. Detective Beard then asked for and received consent to search Teffera’s person. That search revealed no drugs, so Beard thanked Teffera for his cooperation and walked back into the bus terminal.
While interviewing Teffera, Beard noticed Cobb exit the terminal, glance over at Beard and Teffera talking, and make a U-turn into the station again. This conduct aroused Beard’s suspicions. So, when Beard returned to the station after talking to Teffera and spotted Cobb waiting in line at a fast food counter, he decided to follow him. Beard, now joined by Crispino, saw Cobb walk out of the station, join up with Teffera and Derrick Johnson — a man whom Beard knew to be a gypsy cab driver — and head down the street toward Johnson’s cab. When the officers caught up with Cobb, he was seated in the right rear seat of the cab. Beard approached the cab and tapped on the window next to Cobb. After Cobb opened the door, Beard identified himself and asked for permission to speak with him. Beard then asked Cobb if he had come to Washington on a bus; Cobb said “no” and explained that he had come to the terminal to pick up his “buddy” Teffera, whom he was now taking back to Cobb’s home in Marlow Heights, Maryland. After more questioning, Cobb consented to a search of his person.
Beard’s search of Cobb was more fruitful than his previous search of Teffera. Beard discovered a large plastic bag con- *1085 taming chunks of rock cocaine hidden inside the crotch area of Cobb’s pants. Cobb was then arrested. After Cobb was handcuffed, Teffera exclaimed, “I don’t know him. I don’t know him.” He too was then arrested, and a subsequent search of his body produced $130 in cash, a photograph of Teffera and Cobb together, and a New York to Washington bus ticket. On the back seat of the cab, the officers found another New York to Washington bus ticket and a second photo of Cobb and Teffera. The two bus tickets were subsequently found to be consecutively numbered and to have been paid for in cash by one person at 5:09 p.m. on November 4.
Both Cobb and Teffera were indicted and tried for possession of cocaine base with intent to distribute. At trial, the government presented the officers’ testimony as to the events recounted .above. Additionally, in an effort to connect Teffera with the drugs found concealed on Cobb, the government presented the expert testimony of Detective David Stroud. Stroud opined that drug couriers sometimes work in teams. In those cases, according to Stroud, the person not carrying the drugs is there (1) to protect the “mule” — the person actually carrying the drugs — from being robbed; (2) to insure that the mule does not abscond with the drugs; and (3) to divert the police’s attention from the mule. Detective Stroud further testified that in the case of two couriers, they often split up after reaching a bus or train terminal and later meet at a prearranged location.
At the end of the government’s case-in-chief, Teffera moved, unsuccessfully, for a judgment of acquittal. Teffera presented no defense evidence, and the jury returned a guilty verdict as to both Cobb and Teff-era on April 15, 1991.
II. Discussion
On appeal, Teffera contends that the government’s evidence was insufficient for a reasonable juror to find beyond a reasonable doubt that he was guilty of possession with intent to distribute the cocaine found in Cobb’s pants. The standard for overturning a jury verdict for insufficient evidence is, from a defendant’s viewpoint, daunting. To recite the familiar litany: We review the record only to determine whether, viewing the evidence in the light most favorable to the government,
“any
rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.”
Jackson v. Virginia,
Here, the government alleges that there are two analytical paths that a reasonable juror might have followed to the conclusion that Teffera was guilty of possession of the drugs found concealed inside Cobb’s trousers; the hypothetical juror could have determined that Teffera committed the substantive crime of possession by aiding and abetting Cobb’s possession or by constructively possessing the drugs himself. We assess those arguments in turn.
A. Aiding and Abetting
Under 18 U.S.C. § 2(a), a person who “aids, abets, counsels, commands, induces, or procures” a crime is punishable
*1086
as a principal for that crime.
2
To prove that a defendant aided and abetted the possession of illegal narcotics, the government need not show that a defendant ever physically possessed or otherwise controlled the movement of the drugs; rather, it must demonstrate “sufficient knowledge and participation to indicate that [the alleged aider and abettor] knowingly and wil-fully participated in the offense in a manner that indicated he intended to make it succeed.”
United States v. Raper,
According to the government, the evidence shows that Teffera knowingly sought to facilitate Cobb’s possession of the drugs by acting either as a lookout or as a diversion so that Cobb could escape detection as he passed through the bus station. To support this theory, the government highlights the following evidence: (1) the bus tickets, photos and testimony that demonstrate that Cobb and Teffera were travelling together; (2) Teffera’s use of a false name and his false statements that he was travelling alone and was going to Columbia Road in Washington; (3) the expert testimony of Detective Stroud that a drug courier is often accompanied by a second person who acts as a diversion or lookout; and (4) the testimony that Cobb and Teffera got off the bus together, split up, and then reunited before leaving the bus terminal. We find, however, that based on this evidence alone, a reasonable juror could not find beyond a reasonable doubt that Teffera knowingly traveled with someone who was carrying drugs, much less that he actively assisted in the drug’s transport.
The government’s aiding and abetting theory runs into rough sledding from the outset. The most basic prerequisite for an aiding and abetting conviction is proof that the alleged accomplice knew of the criminal venture’s existence.
See, e.g., Raper,
While circumstantial evidence may of course sustain the jury’s verdict, in this case the government’s web of inference is too weak to meet the legal standard of sufficiency. There are innumerable reasons why Teffera might have wanted to distance himself from Cobb. For example, Teffera may have known that Cobb was frequently in trouble with the law and wished to avoid getting caught up in the same net with Cobb. Or, Teffera may have suspected that Cobb was currently involved in some sort of criminal venture, but did not know what the specific venture was— an inference that is particularly plausible here since the only direct evidence of Cobb’s criminal activity was hidden beneath Cobb’s clothes.
4
Courts have found
*1087
that evidence that implies this sort of general knowledge of criminality afoot is insufficient to sustain a conviction for aiding and abetting a specific crime.
See United States v. Pena,
But, in any case, it is not a crime simply to travel — even knowingly — with someone who is carrying drugs; to be liable for the substantive offense, one must actively seek to aid or assist the person in possessing the drugs.
See United States v. Stanchich,
This the government has utterly failed to do. It first argues that Teffera demonstrated his stake in the venture by acting as a lookout. But the evidence is woefully insufficient to support this allegation. Teffera’s movements as he passed through the station are perfectly consistent with innocence and raise no inference that he was a lookout: He got off a bus with a friend, went to get a cab while the friend stopped to pick up a snack, and then met up with the friend again to leave.
Cf. Reid v. Georgia,
*1088 Although it appears that similar evidence may have been available to the government in this case, that evidence was never introduced at trial and thus cannot support the jury’s verdict. During closing argument, the prosecutor repeatedly referred to Detective Beard’s alleged testimony that Teff-era made eye contact with Cobb as Teffera was being interviewed by Beard, and that this eye contact alerted Cobb of the police presence and prompted Cobb to about-face back into the station. As the government now concedes, however, Detective Beard testified to those facts at the suppression hearing, not at the trial. See Appellee’s Brief at 40. Stripped of this alleged eye contact, there is nothing about Teffera’s conduct that raises an inference that he was playing the lookout role, and any such conclusion would have to be based on conjecture. 5
That leaves us with the government’s theory that Teffera acted as a diversion for Cobb. In contrast to the government’s lookout argument, the government does have some evidence that supports this hypothesis: Teffera’s false statements to Detective Beard that he was travelling alone and that he was going to Columbia Road could have been designed to divert attention from Cobb, and thus to aid Cobb in escaping from the bus terminal. The government’s problem, however, is that those misstatements are at least equally consistent with other plausible hypotheses. For example, even if Teffera knew that Cobb was transporting drugs (a fact that, as noted above, we do not think the government has proved sufficiently), Teffera’s attempt to distance himself from Cobb is just as consonant with an innocent person’s fear of being associated with a guilty person as it is with an intent to help Cobb get out of the station undetected. Given the lack of any other incriminating evidence against Teffera, the conclusion that the lies were an attempt to divert attention from Cobb and not the reasonable reaction of a scared but noninvolved acquaintance, crosses the line from permissible inference to improper speculation.
Cf. Long,
B. Constructive Possession
Turning now to the government’s claim that the evidence would permit a reasonable juror to find that Teffera constructively possessed the drugs, we encounter many of the same problems that infected its aiding and abetting theory. First, constructive possession must be knowing.
See Jenkins,
Second, constructive possession requires a showing of control and dominion over the contraband; there must be “some action,
*1089
some word, or some conduct that links the individual to the narcotics and indicates that he had some stake in them, some power over them.”
United States v. Pardo,
Conclusion
The responsibility for drawing inferences from facts lies primarily with the jury, and we impinge on the jury’s discretion in that regard only when we are convinced that its verdict violates the defendant’s due process right to be convicted upon “proof beyond a reasonable doubt of every fact necessary to constitute the crime with which he is charged.”
In re Winship,
So ordered.
Notes
. Teffera's appeal was consolidated with that of Thomas Cobb. We affirm Cobb’s conviction in a separate order issued today. Also, since Teff-era has been imprisoned for well over a year, we instruct the clerk of this court to issue the mandate in his case immediately.
. We have recognized that a person may he convicted of aiding and abetting the possession of drugs.
See United States v. Poston,
. The technical elements of aiding and abetting are: (1) the specific intent to facilitate the commission of the crime by another; (2) "guilty knowledge" by the alleged abettor; (3) commission of the substantive offense by someone else; and (4) assistance or participation in the commission of the offense.
See United States v. Poston,
.Of course, if Teffera knowingly performed as an active lookout for a criminal operation whose general object he was aware of, but without knowledge of the exact nature of the operation, he could be found guilty on an aiding and abetting theory.
. Finally, we note that Teffera’s movements as testified to at trial are inconsistent with the government's own expert testimony about a lookout's functions. According to Detective Stroud, the lookout is supposed to protect the mule from a robbery and make sure that the mule does not sneak away with the drugs. After Teffera left Cobb's side, Teffera was in no position to fulfill either of those roles. Standing outside the terminal, he could not "watch Cobb’s back” or make sure that Cobb did not "get greedy” and run off with the drugs. Thus, the expert testimony provides scant support for the government's argument that Teffera was a lookout.
. Because we find that there was insufficient evidence to convict Teffera, we need not address Teffera’s other claims. We do note, however, that even if we found that the evidence was sufficient to support the verdict, we would have had to reverse because of the prosecutor's repeated references during closing argument to the alleged eye contact between Teffera and Cobb. No evidence of this fact was adduced at trial, and these remarks were clearly improper. It is true that we would normally not find such remarks sufficiently prejudicial to warrant reversal when the trial judge gives a cautionary instruction on this point.
See United States v. Perholtz,
