welcome back. live in sanford, florida, i'm ashleigh banfield. the dna evidence in the spotlight yesterday at the george zimmerman second-degree murder trial. it's the csi part of this trial where the mystery goes down to the molecule. trayvon martin's fingernails, as well as the sweatshirt he was wearing the night he was killed and that gun zimmerman used to kill him, all featured heavily in the courtroom yesterday. and all of them tested in the effort to get to the bottom of what exactly happened in the scuffle between those two people that night. joining me to figure out what mattered and what really didn't in all of that very arcane information is defense attorney midwin charles, jean jecasarez,o