A striking new analysis published this weekend found that federal prosecutors failed to pursue civil rights complaints against police officers a full 96 percent of the time.

The investigation, conducted by Pittsburgh Tribune-Review reporters Brian Bowling and Andrew Conte, examined 3 million federal records regarding criminal complaints against law enforcement from 1995 through 2015. The findings come against a backdrop of increased attention on police misconduct, including evidence of racial discrimination, unlawful shootings, surveillance, imprisonment, and torture.

Bowling and Conte uncovered “12,703 potential civil rights violations turned down nationwide out of 13,233 total complaints,” including “high-profile incidents in Ferguson, Mo., Chicago and New York City.”

In comparison, the Department of Justice rejected roughly 23 percent of complaints for other crimes.

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“The most frequent reasons cited for declining civil rights complaints involving officers: weak or insufficient evidence, lack of criminal intent required under a 1945 Supreme Court ruling standard, and orders from the Justice Department,” Bowling and Conte report. 

Craig Futterman, a law professor who founded the Civil Rights and Police Accountability Project at the University of Chicago, told the Tribune that “the failure to aggressively bring those cases has allowed too many abusive officers to believe that they can operate without fear of punishment.”