An important obligation of the CWC is the adoption of appropriate national implementing legislation, but even after the adoption of an action plan by the OPCW to encourage state parties to rectify this situation, many states parties fail to meet this obligation. Comprehensive national implementing legislation is not only necessary to fully meet the obligations to the CWC, but it is vital in preventing non-state actors from gaining access to chemical weapons and UNSCR 1540 has rendered it a mandatory requirement. Although the CWC has an effective verification regime by international inspectors of the OPCW, this may not always be the case when faced with non-state actors if there exists no national legislation that grants easy access to private residences.