Mo. Rev. Stat. § 226.400: Concurrent jurisdiction ceded to United States.

This state hereby cedes to the United States concurrent jurisdiction to regulate use of such parkway areas and traffic on such parkway road, to protect the areas and property thereon belonging to the United States from damage, depredation or destruction, to operate and administer the areas and property of the United States embraced in said parkway as a national parkway, when consistent with the current uses of other federal departments through whose areas such parkway extends.