A year long study by the Washington Post of all shootings by the the police in incidents of law enforcement in the U.S. shows only about 4% of the incidents involve police killing unarmed black persons. Yet a disproprotionate number of unarmed men shot are black or Hispanic- 3 of 5 people. The large majority of incidents involved people who were mentally troubled most of whom carried a weapon, persons carrying a weapon, or persons running from the police when asked to stop. The WP has compiled every police shooting in its database for analysis, something even the FBI does not have and is only now starting to put together. For police the hard part is when to know a certain behaviour such as reaching into the pocket after a police chase was harmless or risking the officer's life, as shown in a video carried by officer Lisa Mearkle in Hummelstown, Pennsylvania, for one of the shootings. Mearkle was acquitted by the jury.