WY: Guv signed bill in Feb 2013, which went into effect July 1, 2013, where silencers are legal for all hunting in WY.http://www.fieldandstream.com/blogs/fie ... unting-wyo
ID: from ID Fish and Game website.
Idaho Fish and Game does not prohibit the use of silencers. However, ATF (Alcohol, Tobacco, and Firearms) requires a permit to possess and use a silencer. I recommend you contact the local ATF office for the appropriate applications.https://fishandgame.idaho.gov/content/q ... e-silencer
MT: HB205 Bill to allow suppressors for all hunting vetoed by Guv on 5/06/2013http://legiscan.com/MT/bill/HB205/2013
MT: HB27 to allow use of suppressors for hunting wolves outside of big game seasons vetoed by Guv 3/28/2013.http://legiscan.com/MT/bill/HB27/2013
If you look at the votes for each bill above in the H and S, there was a good majority for the Bills. For whatever reason, the MT Guv is the problem.