(1) such entry is in accordance with a program submitted to and approved by such department or agency: Provided, That no entry shall occur when the head of such Federal department or agency, or his designee, shall have certified that entry is inconsistent with national security;
(2) the means by which noxious plants are destroyed are acceptable to the head of such department or agency; and
(3) the same procedure required by the State program with respect to privately owned land has been followed.
(Pub. L. 90–583, § 1, Oct. 17, 1968, 82 Stat. 1146.)