. >> when he listened that tape, undistorlted in the city manager's office, he broke down and cried like a baby, hearing his son beg for help before he was shot and killed. >> reporter: the police department was criticized after the shooting, not testing zimmerman for drugs or alcohol. apparently not knowing that he was on adderall, failing to ask questions if they neumar tin, who was living just down the block and sending narcotics investigators to a homicide. so, which side does this information benefit? >> there's a lot here that seems to help the defense team. but let's remember. trayvon martin was still shot and killed by george zimmerman. and so even if zimmerman was on his back, even if he was losing a fight, he still has a lot of explaining to do and it's going to have to prove that trayvon martin was the initial aggressor. >> reporter: and for martin, we learned tonight he was slightly better built than previously thought and had thc, or marijuana, in his system, the night he was shot. experts tell us likely from using the drug a few days prior. we also learned that the bullet t