This chart shows why the prosecution over Freddie Gray's death is so remarkable

The criminal charges brought against the six Baltimore police officers involved in Freddie Gray's arrest are remarkable because police are almost never tried for killing people in Maryland.

The data in the chart above, from the American Civil Liberties Union of Maryland, shows that police were charged in less than 2 percent of police-involved killings between 2010 and 2014. In these killing