With regards to Kansas, I searched the internet and most people said NO but nobody could point to any specific laws/statutes. I also searched the KS State Statues and never found anything related to silencers/suppressors. I thought that maybe I was misusing the search function or not looking in the right places, though.
Here are the KS statutes:
Nothing to be found with regards to silencers or suppressors so I emailed the Kansas Department of Wildlife and Parks. Here is their reply:
Silencers/Suppressors are not allowed for hunting in KS. No specific statute prohibits suppressors but they are not included in our legal equipment for any species.
KS Dept. of Wildlife & Parks
512 SE 25th Ave.
Pratt, KS 67124
This reply troubles me, however; I always thought that the interpretation of "law" was that something is legal unless it is deemed illegal (not the other way around). In other words, it's not illegal unless the law says it is. Since KS law says nothing about hunting with a silencer I would have assumed it was a legal act. Even if I had the law printed out in-hand if I got stopped by a game warden it wouldn't do any good since they interpret the law "backwards."
I don't have the funds, though, to be a "test case" of the constitutionality of the law but I thought I'd let everyone know my findings.