18 U.S. Code § 3117 - Mobile tracking devices
(a) In General.— If a court is empowered to issue a warrant or other order for the installation of a mobile tracking device, such order may authorize the use of that device within the jurisdiction of the court, and outside that jurisdiction if the device is installed in that jurisdiction.
Source(Added Pub. L. 99–508, title I, § 108(a),Oct. 21, 1986, 100 Stat. 1858.)
Section effective 90 days after Oct. 21, 1986, and, in case of conduct pursuant to court order or extension, applicable only with respect to court orders and extensions made after such date, with special rule for State authorizations of interceptions, see section 111 ofPub. L. 99–508, set out as an Effective Date of 1986 Amendment note under section 2510 of this title.