Well, the SC over ruled state laws.
http://en.wikipedia.org/wiki/Fleeing_felon_rule#U.S._Law
How come I get a 404 when I click on http://en.wikipedia.org/wiki/Charging_felon_rule#U.S._Law?
Officer Wilson's error was to go on patrol without packing a proper elephant gun.
Works for me.
A police officer may not seize an unarmed, nondangerous suspect by shooting him dead...however...Where the officer has probable cause to believe that the suspect poses a threat of serious physical harm, either to the officer or to others, it is not constitutionally unreasonable to prevent escape by using deadly force.
—Justice Byron White, Tennessee v. Garner[3]