Cheryl Corley

Jury selection begins Wednesday in the murder trial for Chicago police officer Jason Van Dyke. The officer, who is white, is accused of killing 17-year-old Laquan McDonald, who is black, as he walked down the middle of a city street holding a knife.

The case has come to embody many of the political and racial tensions that grip the city, and the massive distrust between communities of color and police. In fact, one protest chant has become a mantra in the case: "Sixteen shots and a cover-up."

Despite a dip in shootings and murders for the year, Chicago suffered one of its bloodiest weekends in recent history last weekend. Police say 33 shootings occurred between Friday and Sunday nights, fueled mostly by gang violence. The incidents left a dozen people dead and dozens wounded. Now, the city's mayor and police superintendent say the city's residents who live in troubled areas of the city should do more to help stop the bloodshed.

The violence occurred between 6 p.m. Friday and 11:59 p.m. Sunday night. Nearly 70 people including several children were wounded.

There are slightly more than 2 million people incarcerated in the United States — that's nearly equal to the entire population of Houston. Among those prisoners, thousands serve time in solitary confinement, isolated in small often windowless cells for 22 to 24 hours a day. Some remain isolated for weeks, months or even years.

"You're shut off from the world and you wait," says Olay Silva, a 41-year-old inmate serving time in Bismarck, N.D.'s maximum-security prison. Silva spent six months in solitary after he was involved in a stabbing. "You just sit there and wait."

With the rise of videos showing violent and often deadly encounters between police and citizens, there's also been an increase in the creation or expansion of civilian oversight groups to monitor police departments. Today, there are about 18,000 police departments in the U.S. and, according to the National Association for Civilian Oversight of Law Enforcement, there are about 200 civilian groups that monitor police.

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ARI SHAPIRO, HOST:

All over America today, students staged walkouts to protest school shootings. Let's hear now from Chicago where students rallied against the wider epidemic of gun violence in their city. NPR's Cheryl Corley has this report.

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