Martin Kaste

Law enforcement is increasingly worried about losing access to powerful tools for searching social media because of changing attitudes at the social media companies that allow the searches.

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Americans are seeing more homeless camps, especially on the West Coast. A number of cities there have declared emergencies over the problem, and as they struggle to find solutions, an angry debate has broken out about how much tolerance should be shown to illegal camps that crop up in public spaces.

The shooting of Keith Lamont Scott, a 43-year-old African-American man, by Charlotte, N.C., police is under investigation and the circumstances are very much in dispute, but when you listen to protesters, you hear that their frustration isn't about just this one case.

In the aftermath of the Sept. 11 attacks, many beloved public spaces were abruptly closed or had their access severely restricted. At the time, the public generally resigned itself to the new restrictions as a necessary evil in a time of war.

Fifteen years later, the public has stopped noticing. In some cases, such as scenic overlooks at certain dams, the government spent millions on new roads and bridges to allow the public access from less risky positions. But in other places, the restrictions remain, and it's the public space itself that has faded from view.

When should police be able to deactivate your social media account?

The question is becoming more urgent, as people use real-time connections in the middle of critical incidents involving law enforcement.

In the case of Korryn Gaines in Baltimore County, Md., earlier this month, police said that a suspect actively using a social media connection makes a standoff worse.

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AUDIE CORNISH, HOST:

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

On Sunday, in the hours after the attack on officers in Baton Rouge, La., police reformers were quick to condemn the killings — and there were touching efforts to bridge the divide between the black community and police, such as a cookout in Wichita, Kan. Planned as a protest, it was repurposed as a community barbecue with local police.

The recent targeted attacks on police in Dallas and Baton Rouge have law enforcement on edge. Some departments are telling officers to patrol in pairs when possible, and to be extra vigilant about possible ambush.

Complicating matters is the question of how to interpret and react to the presence of a gun. With more Americans now exercising their legal right to carry firearms, police find themselves having to make rapid judgments about whether an armed citizen is a threat.

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