ACLU to Justice Dept.: Tell us how cops use GPS to track Americans[ Fri, 18 Jan 2013 17:12:30 GMT ]After the Supreme Court ruled that GPS monitoring constituted a "search" under the Fourth Amendment, the Department of Justice drew up two memos outlining guidance for law enforcement. The American Civil Liberties Union filed a request to see the memos, yet received versions that were heavily redacted. So how will Americans be tracked? asks the advocacy group.