There is a very interesting case that has been in the LATimes recently, about a military type accused of 'war crimes' in Iraq. It gives an interesting parallel to the lisk and other investigations. Recently some people in the military in Iraq complained about one of their more senior members killing civilians for sport. Of course they were told to ignore it, but eventually it was pursued by somebody and charges did result. The guy boasted about killing hundreds. He was initially charged with killing a small girl and an old man in Iraq. In both cases obvious civilians he killed from a great distance. In the last week or so he has also been accused of doing the same in Afghanistan. One example was a guy tending goats who he shot for sport. When he finished his tours or retired, he almost certainly would have become a cop, and not a low level cop. Back when these invasions, Afghanistan and Iraq, were fairly new, it was common to see a certain kind of video on YouTube. A young American soldier would be sport shooting some wounded person or blasting up an obviously dead body, and he would upload the video to YouTube. There was a long while when a few or more of those videos would pop up on YouTube every day. There were probably hundreds or thousands of those videos, very many of them. Then at some point YouTube clamped down and forbade that kind of video. Those individual American soldiers who learned to get a kick out of shooting improperly, hundreds of whom uploaded videos, mostly tried to become cops. Somebody who does that isn't Einstein and they probably have to choose between $10 an hour to work hard at Walmart or $30 an hour to strut around as a cop. So you have an upper echelon of cops, spread around the nation, who are like the LATimes guy, and they are leading hundreds or thousands of lower level cops like the YouTube types, all interspersed in various police departments across the country. There would be various things peculiar to those conflicts, things soldiers did, that most people would not recognize. When one of those soldiers decides to return to killing for whatever reason, he will leave some signature that identifies him as part of some group, and protects him from investigation. Policing is not an archetypal part of society, but fraternal organizations are. A cop who recognizes that kind of thing in a murder has a much stronger loyalty to the killer than to his policing job.