A Portland lawyer says suffering by African Americans at the hands of slave owners is to blame in the death of a 2-year-old Beaverton boy. Randall Vogt is offering the untested theory, called post traumatic slave syndrome, in his defense of Isaac Cortez Bynum, who is charged with murder by abuse in the June 30 death of his son, Ryshawn Lamar Bynum. Vogt says he will argue -- "in a general way" -- that masters beat slaves, so Bynum was justified in beating his son.