The link below shows all the WMA's (Wildlife Management Areas)located within the state of Idaho. I'm not too sure about some located in the central and southern regions of the state, but some of those listed in the north probably have more spent lead rifle bullets laying around the woods than shot! I suspect the same for some in the the central region WMA's.
One of them was a favorite area for deer and elk hunting in my youth, and is virtually devoid of waterfowl, due to the mountainous and timbered terrain. Which leaves the question-should bullets, or will bullets constructed with lead be banned as well?
http://fishandgame.idaho.gov/cms/wildlife/wma/