Shadow Wolves Apprehension and Tracking Act of 2007 - Authorizes the Secretary of Homeland Security, acting through the Assistant Secretary of Immigration and Customs Enforcement, to establish up to 5 additional units, with up to 15 Customs Patrol Officers in each unit, to operate on Indian reservations located on or near an international border with Canada or Mexico and other federal land by investigating and preventing the entry of terrorists, other unlawful aliens, instruments of terrorism, narcotics, and other contraband into the United States.