The New York City Police Department's use of stop-and-frisk may be causing more young people to mistrust police.
The Vera Institute of Justice, a non-partisan research group, interviewed 500 men and women aged 18 to 25 in five high crime areas who have been stopped at least once by police.
Of those surveyed, 46 percent said police used physical force on them, and 29 percent said they were never given a reason for the stop; 85 percent said they were let go after being stopped.
Nearly 60 percent said they would not go to police even if they were the victim of a violent crime, while 76 percent would not tell police about someone who they knew committed a crime.
Most of those surveyed were African-American or Latino.
The study concludes the practice can compromise the trust between the public and police, ultimately affecting public safety.
A federal judge recently ruled the practice unconstitutional, and ordered changes to it.
The city says the practice helps drive down crime, and is appealing the judge's decision.