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Officers on scene, who, with another officer, tried to revive the teen. >> after you rolled his body over on to his back, did you try to get a pulse? >> yes, sir, did. >> were you able to get a pulse? >> no, sir, i was not. >> what was your role on the cpr attempts on trayvon martin? >> i was doing breaths, sir. >> reporter: in the courtroom, martins mother sat listening to the last moments of her sons life. >> did rescue take over the cpr efforts after they arrived? >> yes, sir. >> what did you...