In Commonwealth v. Rushing, 2013 PA Super 162 (Pa. Super. 2013), the Pennsylvania Superior Court held that, under the Pennsylvania Constitution, law enforcement needs a search warrant, supported by probable cause, to track a subject in "live" or in "real time," the only exception for the warrant being where, as in the instant matter, exigent circumstances make obtaining the warrant impractical.
Superior Court Asks If Where You Are Is Private
The Legal Intelligencer
August 6, 2013