The Department of Homeland Security (DHS) has been buying location data of millions of cellphone users from third party players. According to documents released by the American Civil Liberties Union (ACLU) on July 18, the DHS is buying this data without any warrants to track movements of civilians. The documents show that this vast amount of location data of people are being purchased by various DHS agencies, including the Customs and Border Protection (CBP) and Immigration and Customs Enforcement (ICE) without any judicial oversight, to track people’s movements and use it for “unreasonable government searches and seizures.”