"Maxwell" wrote:
Find any instance were a licensed person in the US
has exited his car at a traffic stop and fired on the police.

Trivially easy:

http://www.usatoday.com/news/nation/...ies-shot_x.htm

http://www.lanecounty.org/News/News_...ease_12821.htm

The OTHER side of the coin:

http://www.columbiamissourian.com/st...top-shootings/