; (4) the term judicial officer means a judge or other officer or employee of a court, including prosecutors, court security, pretrial services officers, court reporters, and corrections, probation, and parole officers; (5) the term law enforcement officer means an individual, with arrest powers, involved in crime or juvenile delinquency control or reduction or enforcement of the laws; (6) the term public agency includes a court system, the National Guard of a State to the extent the personnel of that National Guard are not in Federal service, and the defense forces of a State authorized by section 109 of title 32; and (7) the term public safety officer means an individual serving a public agency in an official capacity, as a law enforcement officer, as a firefighter, as a chaplain, or as a member of a rescue squad or ambulance crew. (b) Offense (1) In general It shall be unlawful for any person to, in any circumstance described in paragraph (2), kill, or attempt or conspire to kill, a current or former judicial officer or public safety officer, while the officer is engaged in official duties, or on account of past performance of official duties. (2) Circumstances described For purposes of paragraph (1), a circumstance described in this paragraph is— (A) the conduct described in paragraph (1) occurs during the course of, or as the result of, the travel of the defendant or the victim— (i) across a State line or national border; or (ii) using a channel, facility, or instrumentality of interstate or foreign commerce; (B) the defendant uses a channel, facility, or instrumentality of interstate or foreign commerce in connection with the conduct described in paragraph (1); (C) in connection with the conduct described in paragraph (1), the defendant employs a firearm, dangerous weapon, explosive or incendiary device, or other weapon that has traveled in interstate or foreign commerce