Officers "shall use only the force that is objectively reasonable, necessary and proportional to effectively and safely resolve an incident."

The Phoenix Police Department's new use of force policy is creating potentially dangerous confusion among the officers who have to follow it.

Phoenix police officers have orders redefining when they may use violence or physical force. The policy taking effect is a win for interim Chief Michael Sullivan as union membership opposes his bid for the permanent role.

The chief of Phoenix police is discussing his department's new use of force policy. The "Zero Day" star and "Late Show" host Stephen Colbert let a haunting silence hang in the air for several seconds.