Good point actually. What seems like an incentive for good behavior might be an incentive for cover up.  The officer that turns in another might face retaliation trying to do the right thing also.  If you are a lawyer and break the law, in some cases you could be disbarred.  Lawyers in some ways are held to a higher standard because they are not ignorant to the law.  Police officers should be held to a similar standard and should simply lose their jobs or be barred from anything related to law enforcement in certain situations where they break the law.