Here’s a link to an excellent article by Mike Riggs for Reason.com about why it is nearly impossible to fire bad police officers: Why Firing a Bad Cop is Damn Near Impossible: A Short History of the “law enforcement bill of rights”
Here is the key quote:
here’s how a typical police misconduct investigation works in states that have a law enforcement bill of rights in place:
A complaint is filed against an officer by a member of the public or a fellow officer. Police department leadership reviews the complaint and decides whether to investigate. If the department decides to pursue the complaint, it must inform the officer and his union. That’s where the special treatment begins, but it doesn’t end there.
Unlike a member of the public, the officer gets a “cooling off” period before he has to respond to any questions. Unlike a member of the public, the officer under investigation is privy to the names of his complainants and their testimony against him before he is ever interrogated. Unlike a member of the public, the officer under investigation is to be interrogated “at a reasonable hour,” with a union member present. Unlike a member of the public, the officer can only be questioned by one person during his interrogation. Unlike a member of the public, the officer can be interrogated only “for reasonable periods,” which “shall be timed to allow for such personal necessities and rest periods as are reasonably necessary.” Unlike a member of the public, the officer under investigation cannot be “threatened with disciplinary action” at any point during his interrogation. If he is threatened with punishment, whatever he says following the threat cannot be used against him.
What happens after the interrogation again varies from state to state. But under nearly every law enforcement bill of rights, the following additional privileges are granted to officers: Their departments cannot publicly acknowledge that the officer is under investigation; if the officer is cleared of wrongdoing or the charges are dropped, the department may not publicly acknowledge that the investigation ever took place, or reveal the nature of the complaint. The officer cannot be questioned or investigated by “non-government agents,” which means no civilian review boards. If the officer is suspended as a result of the investigation, he must continue to receive full pay and benefits until his case is resolved. In most states, the charging department must subsidize the accused officer’s legal defense.
A violation of any of the above rights can result in dismissal—not of the officer, but of the charges against him.
Because of these special due process privileges, there’s little incentive for police departments to discipline officers. In most cases, it’s more financially prudent to let a District Attorney or outside law enforcement agency do the heavy lifting, and then fire the officer if he’s convicted. This is the only “easy” way, under police bills of rights, for departments to get rid of bad cops–which essentially means the only way to get rid of bad cops is if some other law enforcement agency can make a felony charge stick. This is the biggest problem with law enforcement bills of rights–they encourage police departments to let external forces determine what behavior is unacceptable.