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Exactly what george zimmerman knew about floridas stand your ground law and when he knew it were the focus of todays murder trial. phil keating has the latest from sanford tonight. >> you see george over here? >> how you doing, george? >> reporter: george zimmermans former criminal professor took the stand today after the judge ruled they can bring back his past passion for pursuing a career in law phone respectment due to zimmermans own words played for the jury yesterday from a sean hannity in...