"but the question is whether or not arrests, charges, etc. can begin at a local or state level when the arrestee is a federal agent.... He might spend a couple hours in the Mayberry jail swapping stories with Otis but the feds will come get him and I don't think Andy can do anything about it."
What does that mean? I suppose this could be a Kansas myopia thing, I don't know much about the place except that a guy helped pull my bus out of the mud there once - but he had North Carolina plates come to think of it, but are you genuinely suggesting that federal agents are immune from prosecution for local or state crimes? Why would you be under the impression that would be the case? Is that what your experience tells you? Chilling if yes.
Many, if not all, of these documents have not been publicly seen before this release.
Because nobody ever thought to subpoena them before even though it would have been standard procedure to do so.