CINCINNATI (AP) — Social activists held hands in a prayer circle outside a courthouse while potential jurors were inside amid tight security Tuesday for the racially charged murder trial of a white former university police officer charged with killing an unarmed black man during a traffic stop. Members of an unusually large jury pool had orientation sessions in the Hamilton County courthouse before filling out 25-page questionnaires that will be studied by the defense and prosecutors before they start questioning candidates in court Oct.