Assuming you have a smaller local police dept and you live in their jurisdiction, The chief of that dept can sign.
The County Sheriff can sign.
The local prosecuting attorney can sign.
A judge who tries felony cases in your jurisdiction can sign.
The head of the state police can sign.
The states Attorney General can sign.
As you move down this list of people, you may find it harder to actually get to them in order to ask about it.
I have no clue how friendly your locals will be to this. My local police department was useless. I was pretty surprised when my Democratic Sheriff signed my first one. He has since signed two more for me. You just don't know until you try.
In my case, I believe being able to walk in and say that I was a licensed collector went a long way towards getting my signatures. I had copies of my C&R license, drivers license, and CPL which I gave him.
Dress appropriately so as to make a good first impression. The best bet would be to try and schedule an appointment to see the person. When asked why you wish to see them, just say that you have some federal paperwork that requires their signature.
I wish you luck. I was nervous as a whore in church on my first one. I just got a form signed for my M11 a couple days ago.
What ya getting?