A Justice Department investigation has found that the Baltimore Police Department has routinely discriminated against black citizens for years. The report issued Wednesday comes after a yearlong investigation following the death of Freddie Gray in April, 2015. Baltimore isn’t the only department that’s been investigated for biased policing by the Obama administration. Since 2000, the Department of Justice has scrutinized almost two dozen police forces around the country. How does Baltimore compare? And have reforms improved policing?