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Bay Area News Group, Kristopher Skinner, File, Associated Press
In this Dec. 9, 2014, file photo, Richmond Chief of Police Chris Magnus stands with demonstrators to protest the Michael Brown and Eric Garner deaths during a peaceful demonstration in Richmond, Calif. In cities and states nationwide, police departments are already altering policies and procedures to temper concerns about police conduct in the aftermath of recent cases of black males dying at the hands of white officers.

COLUMBUS, Ohio — With tensions running high over the killings of blacks by police, departments around the country are changing policies and procedures.

They are trying to curb the use of deadly force, ease public distrust and protect officers from retaliation.

New York City, for example, plans to issue stun guns to hundreds more officers.

The Milwaukee department is making crisis-intervention training mandatory.

And in Akron, Ohio, police have begun working in pairs on all shifts for their own safety.