TIMOTHY WILLIAMS

Videos involving white officers and black civilians have become ingrained in the nation’s consciousness -- to many people, as evidence of bad police conduct. And while they represent just a tiny fraction of police behavior, they have begun to alter public views of police use of force and race relations, experts and police officials say.

As many as 80 percent of the girls in some states’ juvenile justice systems have a history of sexual or physical abuse, according to a report released Thursday. The report, a rare examination of their plight, recommends that girls who have been sexually trafficked no longer be arrested on prostitution charges.

The police in Ferguson, Mo., broke their weeklong silence Friday and identified the officer involved in the fatal shooting of an unarmed African-American teenager, as demanded by protesters and the family of the victim.