Here is the opinion in US v. Gabrion. It raises an interesting question whether there is federal criminal jurisdiction in national forests. The court, 2-1, found that the US does have criminal jurisdiction over national forest lands, in this case, the Manistee National Forest. Judge Moore’s concurring opinion delved into federal Indian law in response to the appellant’s claim that state and federal concurrent jurisdiction over national forest lands was a violation of equal protection (it isn’t — just ask an Indian):