George Zimmerman's head is inspected by an officer inside a police station in Sanford, Florida, in this frame grab taken from police video dated February 26, 2012. The neighborhood watch volunteer who shot dead an unarmed black teenager in Florida appeared uninjured when he was brought into the police station on the night of the shooting, according to a video released by the Sanford police department. Zimmerman told police he shot Trayvon Martin inside a gated community on Feb. 26 in self-defense after Martin attacked him and repeatedly bashed his head into a concrete walkway. REUTERS/Sanford Police Department/Handout