Indiana Code Title 35. Criminal Law and Procedure § 35-33-5-12

Sec. 12. (a) A law enforcement officer or law enforcement agency may not use a real time tracking instrument that is capable of obtaining geolocation information concerning a cellular device or a device connected to a cellular network unless:

(b) If a law enforcement officer or law enforcement agency uses a real time tracking instrument described in subsection (a) based upon the existence of exigent circumstances, the law enforcement officer or law enforcement agency shall seek to obtain an order issued by a court based upon a finding of probable cause not later than seventy-two (72) hours after the initial use of the real time tracking instrument.