The American Civil Liberties Union of Illinois says that Chicago police officers are employing the controversial “stop and frisk” practice more than officers in New York City, where a judge ruled the widespread practice discriminated against minorities.

In a study released Monday, the ACLU says that Chicago officers last summer conducted more than 250,000 stops of people who weren’t arrested.

The report based on police department data found that the practice was employed at a rate that was four times as high as New York “at the height” of officers’ use of the practice there.

The ACLU also says that almost three-fourths of those stopped were African-American, though they make up about a third of the city’s population.

The Chicago Police Department did not immediately return a message seeking comment.

(AP)