; (B) by striking subsection (b); (C) by redesignating subsection (a) as subsection (c); (D) by inserting before subsection (c), as so redesignated, the following: (a) In general No officer or employee of a governmental entity may install or direct the installation of a tracking device, except pursuant to a warrant issued using the procedures described in the Federal Rules of Criminal Procedure (or, in the case of a State court, issued using State warrant procedures and, in the case of a court-martial or other proceeding under chapter 47 of title 10 (the Uniform Code of Military Justice), issued under section 846 of that title, in accordance with regulations prescribed by the President) by a court of competent jurisdiction. (b) Emergencies (1) In general Subject to paragraph (2), the prohibition under subsection (a) does not apply in a instance in which an investigative or law enforcement officer reasonably determines that— (A) a circumstance described in subparagraph (i), (ii), or (iii) of section 2518(7)(a) exists