sentences:  ICE officials are also considering creating a sister unit of the Shadow Wolves to patrol the Blackfeet reservation in Montana, on the U.S. border with Canada.The Shadow Wolves comprise an Immigration and Customs Enforcement tactical patrol unit based on the Native American Tohono O'odham Nation in southern Arizona.Shadow Wolf officers are known for their ability to track aliens and drug smugglers as they attempt to smuggle their illegal commodities across the border.