I don't see anything in Idaho's weapons restrictions (in the big game 2009 regs from Fish and Game) about suppressors. Automatic weapons are prohibited, as are firearms which, in combination with sling, scope, and/or any attachments weighs more than 16 lbs.
So, it looks like we're allowed to be polite to our neighbors here! (i.e. not deafen them with our rifles' report)
Just went through this in my home state of South Dakota. After checking various legal status sections of the codified laws could find nothing pertaining to suppressors and there use for hunting.. Took the bull by the horns and called the SD Game Fish & Parks legal department talking to the head legal officer. Was informed there is nothing on state books against hunting with them on either varmits or big game. He even joked that the cows would appreciate the silence better and give more milk. Some areas of the state have urban housing developments encroaching on formerly dog town infested range lands and they want control but not the noise so were appreciated in those areas.
In my searching found every state has there own laws pertaining to use. You need to check your state laws very closely before use.
I sent an email to the Colorado DOW asking about using a suppressors here as I couldn't find anything about it in the regs. Basically I got a reponse saying that suppressors were heavily regulated by the feds and to make sure that any suppressor is properly and legally owned.
Bottom line I didn't get a no, but I also didn't really get a yes. I had been thinking about gettinga suppressed .22 to use while archery hunting to take dusky grouse without spooky nearby big game. So far I haven't bought a suppressor yet and am not sure I would use one here without a more specific answer.
The use of silencers for hunting is not allowed in Texas.
I know a surprising number of people who have NFA licensed silencers. They are quite popular. Here is an interesting bit from Field and Stream, June 1909
THE invention of the Maxim silencer for firearms marked a new era in the manufacture of such weapons, and while many cautious critics were appalled at the idea of a firearm which could send its missile for 100 yards or half a mile with comparatively no sound from the discharge, the history of the months which have elapsed since the production of this device shows no instances of its use by midnight assassins or other law breakers. It has also been claimed that the use of the silencer would enable a more speedy destruction of our already fast disappearing game; but, aside from the employment of the silencer in hunting, it has a value which none can dispute, for it certainly will permit target practice with small caliber rifles where with the ordinary unequipped firearm such practice would be impossible. Under present conditions any flat dweller in the crowded cities may have his own rifle range and practice to an unlimited extent without disturbing his neighbors. The invention of smokeless powder has done away with one objection to indoor rifle practice, and now we have the feature of noise eliminated. Here, at least, the Maxim silencer has a use and a value which cannot be over-rated. Sales of this device were at first hindered to some extent by the fact that the barrel of the rifle must be threaded to receive the silencer which in many cases would have necessitated sending the rifle to the factory or some distant machinist. The Maxim coupling, here illustrated, has since been devised, applicable to the .22 caliber silencer and the attachment to practically any standard .22 rifle may be made by any one in five minutes. The coupling screws into the silencer, and slips over the muzzle of the arm, requiring in any case only the introduction of cylindrical metal bushing to secure a driving fit. Descriptive circular may be had of the Maxim Silent Firearms Co., 38 Park Row, New York.
If you need to reduce your guns noise from a fixed position, like at a private shooting range, there are some easily made noise suppressors possible. Some people line up a bunch of old car tires and shoot through them. It works.
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