In this Nov. 25, 2014 file photo, Cleveland police watch demonstrators block Public Square while protesting against the shooting of 12-year-old boy Tamir Rice, who was fatally shot by a police officer in Cleveland. The revelation that Cleveland police officials didn't review the checkered history of a police officer who fatally shot a 12-year-old boy highlights what some describe as an unnerving truth about policing -- there's no universal standard for how deeply a department should dig into its recruits' pasts. (AP Photo/Mark Duncan, file)
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