Granted this doesn't protect them from civil suits.
Police shooting at Redondo Beach man during Dorner manhunt was ‘reasonable mistake,’ DA says
Officer Brian McGee acted in “an atmosphere of fear and extreme anticipation” when he purposely rammed David Perdue’s pickup truck and fired at least three shots at him on Feb. 7, 2013, mistakenly believing Dorner was at the wheel. The bullets missed Perdue, who has filed a lawsuit against the city of Torrance.
“McGee’s belief that Dorner was driving the truck was reasonable,” prosecutors said in ruling the shooting was justified.
Police shooting at Redondo Beach man during Dorner manhunt was ‘reasonable mistake,’ DA says
Officer Brian McGee acted in “an atmosphere of fear and extreme anticipation” when he purposely rammed David Perdue’s pickup truck and fired at least three shots at him on Feb. 7, 2013, mistakenly believing Dorner was at the wheel. The bullets missed Perdue, who has filed a lawsuit against the city of Torrance.
“McGee’s belief that Dorner was driving the truck was reasonable,” prosecutors said in ruling the shooting was justified.