may detain an individual only if the individual to be detained is within, or in direct flight from, the area of such offense. (B) Enforcement of certain laws A person granted authority to detain under this section may exercise such authority only to enforce laws regarding any building and grounds and all property located in or on that building and grounds that are owned, occupied, or secured by the General Services Administration Public Buildings Service. (3) Guidance The Secretary, with the approval of the Attorney General, shall issue guidelines to implement this section. . (b) Section 1315(b) of title 40, United States Code, is amended— (1) by inserting and at the end of subparagraph (D)