ATLANTA (AP) — The so-called “Ferguson effect” — officers backing off of policing out of fear that their actions will be questioned after the fact — has been talked about but never really quantified. A new study suggests the effect is a reality, with three-quarters of officers surveyed saying they are hesitant to use force, even when appropriate, and are less willing to stop and question suspicious people.

The nonpartisan Pew Research Center questioned at least 8,000 officers from departments with at least 100 officers between May 19 and Aug. 14 last year — most of it ahead of the fatal shootings of five officers in Dallas and three officers in Baton Rouge.

What it found was a significant fear among police about their safety and about carrying out some of the everyday acts of policing.

It also shows a stark difference in how white and black officers view the protests that have taken place after some of the high-profile shootings of black suspects in the past several years, with black officers believing the protests are genuine acts of civil disobedience designed to hold police accountable, while white officers are more skeptical of the protesters’ motives.