Captain Holt: Okay, so who was the prank man?
Charles: There was no prank. That was just a cover. You see, guys, the point of the explosion was to contaminate the evidence of the Dekalb Street murder.
Jake: But the suspect is in prison, has no ties to organized crime, and no means of bribing an officer. How could he have possibly pulled that off?
Charles: Yeah, Jake, that stumped me for a little bit too, but then something you said gave me an idea.
[flashback:]
Jake: I mean, that kind of evidence would never hold up at trial. You'd be laughed out of court.
[present:]
Jake: Ah, yeah, I remember when I said that. It was awesome. Wait, but who did it?