they've all got form-- tda, gbh, the usual. mix and match. >> okay. next, the murder weapon.m, who's dc growse? right, it says here that you're the gun expert. >> right, well, we're looking for a machine pistol, probably a heckler, possibly an uzi. ballistics can link shells to a specific weapon, so we want that stuff, like, now. >> heard that? >> okay, question, was this a gang-related execution? if so, one of two things: "a," the firearm has been returned to the gang's stockpile. it's gonna be kept in circulation. or "b," it's already been smuggled out of town, and by now it's in wherever. penzance, glasgow, uh-- >> yeah, okay, got the picture. >> growsey, case like this, you never get the weapon. >> well, we'll see about that. yeah, go on. >> okay, it's not a gangland killing. it's an ordinary decent murder. how did the killer get the gun? answer: probably he rented it like a video. there was a bloke the pub, whatever. >> okay, okay, uh, here's what we do: we go through every file of every individual who's ever been involved in a gang or a drug-related shooting incident, o