Being a retired CLEO I'll weigh in on this subject....Foremost, no LEO wants either bad press nor a civil action directed at him. If what you state is true I most strongly suggest you contact a GOOD attorney and have him start the ball rolling. Likely, due the fact that you are alleging official misconduct (thats what it's called here in Florida), once a formal complaint is levied you will immediately begin to see action. You may well have both a civil and CRIMINAL case against that officer and I most strongly suggest you pursue it!
If you review chapter 1983 USC, you will find that it is a violation of Federal law to deny any person any right secured them under the U.S. Constitution....a claim under that act might get you some result, and you are really upping the ante by making a Federal claim....your attorney will know how to pursue the matter.........I would NOT let the issue become stale.
Frankly, if in fact that officer is that corrupt, you have a civic duty to deal with it, that is indeed and infact precisely the sort of thing any decent prosecuting attorney would love to present to a Grand Jury.
And by the way, I most strongly urge you to ignore State specific recommendations....law and responsibilities vary from State to State in terms of who supervises whom. For example, a Californian states that the Sheriff is supervised by his County Commission (or equivelant)....that might be so there, but for example here in Florida a Sheriff is co-equal to any other elected offical in his County...he is a Constitutional Officer under state law and a County Comission CANNOT direct him in the course of his duties. Furthermore, he can appeal ANY negative budgetary action by his Commissioners to the State itself!!...
As I said, get a good attorney that knows YOUR State's laws, and that you feel confident in and do as he suggests. If you still find yourself up against a brick wall, then appeal to the U.S. Attorney's office.