"The American Civil Liberties Union (ACLU) has found that officers routinely use phone location data when pursuing cases, often without a warrant. Carriers, however, don't give tracking or other information out for free. Forbes has reviewed a 2009 document that apparently instructs Tucson, Arizona police on how much AT&T, Verizon, Sprint, T-Mobile, and others charged at that point for everything from wiretaps to voicemail."