In an article dated July 2013, I described how police in Montgomery County Maryland, a D.C. Suburb, shot 14 individuals and killed 9 over the prior three years (http://www.dailycensored.com/maryland-police-shoot-14-kill-9-the-ebbing-police-state/).
This included killing a man with an ice pick, killing a man threatening suicide and killing a robbery suspect after a hostage escaped. Of the 14 shootings, police were not criminally charged in any of the incidents.
Since then, in Nov 2013, 7 Montgomery County police officers shot and killed a man armed with an AR 15 assault rifle, after police attempted to negotiate with the man for 12 minutes (http://baltimore.cbslocal.com/2013/11/19/police-shoot-kill-man-armed-with-rifle/).
While Montgomery County failed to prosecute a single police officer for the shooting of civilians in at least 15 incidents, in October 2014 a Baltimore police officer was sentenced in Montgomery County to 12 months in prison for killing a puppy. It is likely he was prosecuted because his "crime" occurred outside the course of official duty (http://www.washingtonpost.com/local/crime/man-to-be-sentenced-for-killing-puppy-after-it-defecated-on-carpet/2014/10/08/9aa530e2-4ed2-11e4-aa5e-7153e466a02d_story.html).
Meanwhile, in neighboring Fairfax County Virginia, local police have refused to cooperate with a federal investigation of the killing of an unarmed man by a Fairfax police officer. County police have refused to disclose the name or rank of the officer involved in the shooting (http://www.washingtonpost.com/blogs/local/wp/2014/12/04/feds-say-fairfax-county-slowed-federal-investigation-of-john-geer-police-shooting/?hpid=z4).
If police and prosecutors act as if they are above the law, the Supreme Court bears some responsibility for this.
As I wrote in May 2013: