CSI: Miami Season 4 Episode 25

Several members of the Mala Noche gang are killed with a Russian automatic gun, heavy caliber, only presumed target Antonio Riaz, who also ordered the killing of Eric Delko's sister Marisol, got away. While investigating the crime scene Biscayne villa, uniformed officer Jessop is killed by a grenade booby-trap. He was a 27-year old police academy mate of Ryan Wolfe, who is the first in the lab to find their every move is now openly shadowed by the FBI, which has been following up since month suspicions that the Miami CSI would be tampering with evidence and stealing $12,000 in cash, and digs into individual CSI's records, tipped off by at least one mole, only Ryan's forensic expertise gives the whole investigation a decisive turn... Meanwhile Memmo, the Nicaraguan Mala Noche killer of Horatio's wife, tips him off that Riaz was dealing with Rafik Omad, whose trade includes Russian firearms, a line of investigation with a surprising twist...