16 U.S.C. § 408i

Sole and exclusive jurisdiction over and within all the territory that is as of March 6, 1942 or may thereafter be included in that area in the State of Michigan set aside and dedicated for park purposes by the United States as the Isle Royale National Park is assumed by the United States, saving, however, to the State of Michigan the right to serve civil or criminal process within the limits of the aforesaid park in suits or prosecutions for or on account of rights acquired, obligations incurred, or crimes committed in said State outside of said park; and saving further to said State the right to tax persons and corporations, their franchises and property on the lands included in said park; and saving also to the persons residing in said park now, or hereafter, the right to vote at all elections held within the county in which they reside. All fugitives from justice taking refuge in said park shall be subject to the same laws as refugees from justice found in the State of Michigan.