Policing

F.B.I. Chief Links Scrutiny of Police With Rise in Violent Crime

The F.B.I. director, James B. Comey, said on Friday that the additional scrutiny and criticism of police officers in the wake of highly publicized episodes of police brutality may have led to an increase in violent crime in some cities as officers have become less aggressive.

With his remarks, Mr. Comey lent the prestige of the F.B.I., the nation’s most prominent law enforcement agency, to a theory that is far from settled: that the increased attention on the police has made officers less aggressive and emboldened criminals. But he acknowledged that there is so far no data to back up his assertion and that it may be just one of many factors that are contributing to the rise in crime, like cheaper drugs and an increase in criminals who are being released from prison.