It definitely is and assuming that this is a somewhat accurate description of what happened, the police officers involved could easily find themselves behind bars for witness tampering, destruction of evidence amongst other things. And police officers do get sent to prison from time to time for this sort of behavior.
Every once in a great while when there is a massive public outcry and there are no other politically viable alternatives, yes, they do. This is far, far less often than it should happen. Of the instances of police overstepping their bounds I have heard of exactly one police officer being fired, and that was for a clear case of murder that was committed on camera and the victim was a homeless person who was well known and liked. The officer's excuse was that the man (who was known as 'the woodcarver' by locals) had a knife, and he did not put it down in the 2.5 seconds between the time the officer told him to and the time he fired. The man made no threatening gesture with the knife.
I have never heard of a police officer going to jail.
You're either making stuff up or you clearly have no idea what the hell you're talking about.
First, some simple facts. Ian Birk, the police officer who shot the "wood carver", resigned after he learned that there would *no* criminal charges filed against him. [http://www.msnbc.msn.com/id/41632205/ns/us_news-crime_and_courts/t/seattle-cop-who-fatally-shot-woodcarver-quits-force/]
Second, wood carver John T. Williams, the person who was shot bu Birk, had 2 knives on him when he was shot, one which was open a and visible to Birk when Williams walked past his police cruiser. Williams also has an extensive criminal record, a substance abuser and alcoholic. This article doesn't make him seem as dangerous and violent as these people can really be: http://seattletimes.nwsource.com/html/localnews/2012784234_copshooting02m.html I say this as a 14 year full-time paramedic who has worked (and still does) the street of the South Bronx, Alphabet City, Harlem and Spanics Harlem.
Third, the actual shooting was not recorded by video camera, only audio of the officer telling the suspect to put the knife down and then the gunshots. So, you didn't see what happened and *you* sure as hell were not there see it.
Lastly, the officer had a bit more than an excuse of not putting down a 3" blade in "2.5 seconds between the time the officer told him to and the time he fired." Here: http://seattletimes.nwsource.com/html/localnews/2013905500_inquest12m.html
Now, if I told you that just about any person can close a distance of 21 feet in approximately 1.5 seconds would you be surprised? Would you be more surprised to learn that the typical police officer needs approximately 1.5 seconds to draw his pistol from his holster and bring the front sight to eye level? Now remember, most if not all cops have retention holsters, i.e., holsters that must me manipulated in a certain way to release the firearm. And, brining the front sight to eye even doesn't mean you have actually had time to put that sight to the center mass of the person you are about to shoot.
What I just described above was the result of a officer named Dennis Tueller. He came up with what is now famously (among cops and people with pistol permits who take training) know as the Tueller drill: http://en.wikipedia.org/wiki/Tueller_Drill You can read the article he wrote called "How Close Is Too Close: http://www.theppsc.org/Staff_Views/Tueller/How.Close.htm Videos on YouTube demonstrating this: http://www.youtube.com/results?search_query=tueller+drill&aq=0&oq=tueller I should also note that people don't need to be "average" to close this distance (7 yards) in that time (1.5 sec). Massad Ayoob (http://en.wikipedia.org/wiki/Massad_Ayoob) runs this drill with all the civilians he has taught during his LFI classes. He's witnessed the elderly, the morbidly obese and even an obese person who was still recovering from a lower extremity fracture close this distance in a approximately the same time.
Also, read the rest of Birk's testimony: http://seattletimes.nwsource.com/html/localnews/2013905500_inquest12m.html
"Birk told jurors that he believed Williams was impaired when he initially saw him carrying a knife on a Seattle street. "The way he was carrying himself and his posture indicated he was in some sort of altered state," Birk testified during the second day of the fact-finding hearing.
Williams' appearance "along with the knife in his hand made me concerned he might make someone uncomfortable or be a threat," the officer, 27, said of his decision to get out of his car and confront Williams."
"Seattle Police Detective Jeffery Mudd also testified that he would have dropped a knife if ordered to do so at gunpoint by a police officer.
Mudd told jurors that Seattle police officers are trained to treat as an immediate threat anyone standing a short distance away with an edged weapon."
So now I ask you. Do you feel a little differently about a lone police officer encountering a violent drunk with a 3" blade from a distance of 9 to 10 feet away and doesn't put it down when told? Wanna try a little Tueller drill with me holding a knife at that distance and I'll give you any holstered gun you want?