listening to ‘all of the calls,’ the jury had no way of verifying his inferences or of independently reaching its own interpretations.” Op. 983. But as I see it, the problems do not end there. By testifying on numerous occasions on the meaning of ordinary — albeit cryptic — recorded language, Agent Bevington trespassed into the jury’s domain.
Let’s start with the sort of opinion testimony a witness may give in interpreting wiretapped conversations. An expert witness may interpret for a jury coded language generally used in drug conspiracies, much as a lay witness with personal knowledge of a particular drug conspiracy may testify on the meaning of coded language specific to that conspiracy. See United States v. Wilson, 605 F.3d 985, 1025-26 (D.C.Cir.2010); United States v. Rollins, 544 F.3d 820, 830-32 (7th Cir.2008). Yet neither category encompasses Agent Bev-ington’s testimony on the wiretapped conversations in this case. Under the guise of lay opinion testimony, he explained the inferences the jury should draw from recorded conversations involving ordinary language. At that point, his testimony transformed from evidence into argument. See United States v. Peoples, 250 F.3d 630, 640-42 (8th Cir.2001).
Take, for example, “Activation 100,” a conversation between Lonnell Glover and Coolridge Bell, who was also indicted as a coconspirator:
Glover: Now I pay my man 5,000 for every time a 10 of those UI [unintelligible] come in?
Glover: Every time 10 come in, I give him 5.
Glover: Naw to receive it.
Glover: I pays everybody well man. That’s what I’m saying there ain’t no whole lot of room in this shit for me right.
Glover: UI I give him 5, okay so he’ll wind up making $25,000.00, just receiving and picking the shit up for me.
Glover: Alright and I’ll take it and put it other places. I pay the peoples fucking bills you know what I’m saying?
From this barely coherent exchange, Agent Bevington somehow divined that “Mr. Glover is talking to Coolridge Bell about paying Mr. Hampton for receiving shipments of PCP .... $5,000 every time ten gallons were received.”
Consider also “Activation 5982,” referenced in the opinion: “So a boy come pick me up, then I had to ride around with him, when I see you I’m gonna tell you everything been going on, I just man you talking about a hectic motherfucking day.” Somehow, when passed through Agent Bevington’s interpretive prism, this jumble of vagaries becomes crystal clear: Glover was “talking about Mr. Suggs coming to pick him up after he dropped his truck off in the shop, and he is going to tell Mr. Hampton what happened with the search warrant and everything related to that.” That is not to say a juror could not have reached the same conclusions, but rather that such conclusions are fit only for a juror to reach.
As the panel recognizes, the reasoning in United States v. Grinage, 390 F.3d 746 (2d Cir.2004), readily applies to the facts of this case. Op. 982-83. I fear, however, that based on our discussion, a casual reader may infer only one guiding principle from Grinage. In actuality, two may be distilled, and both apply here: First, the jury must not be deprived of the opportunity to independently evaluate the foundation for such testimony based on facts in evidence. See 390 F.3d at 750 (“Whether labeled as an expert or not, the