Police altering policies and procedures after heated nationwide reaction to recent killings

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.