some emotional testimony today at the murder trial of a home owner who shot and killed an exchange student his garage. this is another race involving one of those stand your ground laws-this time in montana. the prosecutors say the home owner set a trap for a 17-year-old by deliberately leaving a purse inside his garage. but the home oregon says he so the the teen in self-defense and did not know where the student was armed. montana's stand your ground laws allow people to use deadly force only if they believe it would save a life, or prevent serious bodily harm. today the student's mother left the courtroom in tears as the police sergeant talked about the dang. he said she shooting left bullet holes in the house and drops of blood on the driveway. an mama reis a former federal prosecutor and currented a junk professor at to fordham law here in new york. set a trap. the prosecutors say it's that clear and he is the criminal. >> it's not an easy case, actually. >> no. >> it certainly looks and can be