Can Police Track You Through Your Cellphone Without A Warrant?

Can Police Track You Through Your Cellphone Without A Warrant?  NPR Stephen H. Sachs: The Fourth Amendment in the 21st Century  Wichita Eagle (blog) Detroiter's case sparks Supreme Court privacy battle  The Detroit News Cops, Cellphones and Privacy at the Supreme Court  New York Times If You Care About Digital Privacy, You Need to Know About This Supreme Court Case  Popular MechanicsFull coverage