of the defendant's head consistent with having been repeatedly slammed into a concrete surface? >> no. if you look at the injuries, they are so minor. >> let's introduce now the injuries here. two lacerations above may not have impacted when the bottom -- >> that's possible. martha: that was said to be a good moment for the prosecution. but the medical examiner did not treat him at the scene, she is going on the photographs. phil keating joins us live. how much material are the prosecutors hoping they will bring in today? >> reporter: quite a bit, martha. several pieces of material, some of it dating back two years, all showing zimmerman's interest and passion pursuing a career in law