1. Short title This Act may be cited as the Border Zone Reasonableness Restoration Act of 2018 . 2. Oversight of power to enter private land and stop vehicles without a warrant (a) In general Section 287(a) of the Immigration and Nationality Act ( 8 U.S.C. 1357(a) ) is amended— (1) in paragraph (5), by redesignating subparagraphs (A) and (B) as clauses (i) and (ii), respectively; (2) by redesignating paragraphs (1) through (3) as subparagraphs (A) through (C), respectively; (3) by redesignating paragraphs (4) and (5) as subparagraphs (E) and (F), respectively; (4) in the matter preceding subparagraph (A), as redesignated— (A) by inserting (1) before Any officer ; (B) by striking Service and inserting Department of Homeland Security ; (C) by striking Attorney General and inserting Secretary of Homeland Security ; and (D) by inserting , to the extent permitted by the Fourth Amendment to the Constitution of the United States after warrant ; (5) in paragraph (1), by striking subparagraph (C), as redesignated, and inserting the following: (C) within a distance of 25 air miles from any external boundary of the United States, or such distance as may be prescribed by the Secretary pursuant to paragraph (2), to board and search for aliens any vessel within the territorial waters of the United States and any railway car, aircraft, conveyance, or vehicle for the purpose of patrolling the border to prevent the illegal entry of aliens into the United States; provided that no vehicle may be stopped at a fixed checkpoint under this subparagraph beyond a distance of 10 air miles from any such external boundary without reasonable suspicion that an individual in such vehicle is inadmissible or otherwise not entitled to enter or remain in the United States