; (2) securing site assets; (3) screening and controlling access to the covered chemical facility and to restricted areas within the covered chemical facility by screening or inspecting individuals and vehicles as they enter, including— (A) measures to deter the unauthorized introduction of dangerous substances and devices that may facilitate a chemical facility terrorist incident or actions having serious negative consequences for the population surrounding the covered chemical facility; and (B) measures implementing a regularly updated identification system that checks the identification of covered chemical facility personnel and other persons seeking access to the covered chemical facility and that discourages abuse through established disciplinary measures; (4) methods to deter, detect, and delay a chemical facility terrorist incident, creating sufficient time between detection of a chemical facility terrorist incident and the point at which the chemical facility terrorist incident becomes successful, including measures to— (A) deter vehicles from penetrating the perimeter of the covered chemical facility, gaining unauthorized access to restricted areas, or otherwise presenting a hazard to potentially critical targets; (B) deter chemical facility terrorist incidents through visible, professional, well-maintained security measures and systems, including— (i) security personnel; (ii) detection systems; (iii) barriers and barricades; and (iv) hardened or reduced value targets; (C) detect chemical facility terrorist incidents at early stages through— (i) counter-surveillance at the site of the covered chemical facility; (ii) frustration of opportunity to observe potential targets; (iii) site surveillance and sensing systems; and (iv) barriers and barricades; and (D) delay a chemical facility terrorist incident for a sufficient period of time so as to allow appropriate response through— (i) onsite security response; (ii) barriers and barricades; (iii) hardened targets; and (iv) well-coordinated response planning