A new investigation by the American Civil Liberties Union shows police tracking of cellphones without court-approved warrants is more widespread than previously known. According to the ACLU, just a fraction of more than 200 police departments that admitted to tracking cellphones acknowledged they have routinely obtained warrants to do so. The tracking is said to be so commonplace that cellular providers are providing police with manuals outlining the range of data they store and the pricing for police to obtain it.