Tennessee has a serious problem with its cops, here is a site that tracks the news reports from around the state on police misconduct, and criminal cops.
http://whentennesseepigsfly.blogspot.com/
IMO, I suspect this type of problem is more widespread than we are being led to believe.
The evidence that this is a widespread problem is that more and more police departments "misinterpreting" wiretap laws to prevent citizens from videotaping their actions.
This is occurring despite court rulings and memorandums from DAs telling police departments that they have no expectation of privacy when working as public employees in a public setting.