A recent American Psychological Association study revealed that police officers speak to Black drivers in a more disrespectful tone during traffic stops than the way they speak to white drivers.

The study analyzed body camera footage from more than 100 police officers and used 250 audio clips from an unnamed mid-sized U.S. city and revealed that officers spoke to Black men in a tone of voice that conveyed less warmth, respect and ease in comparison to white men.

“We were analyzing this footage both to identify challenges with police-community relations and to try to offer some suggestions,” said Nicholas Camp, an assistant professor of organizational studies at the University of Michigan and the lead author of the study.

Read the full article at NBC News.