A/HRC/21/43 request to collect all national legislation relevant to private military and security companies to facilitate analysis by multiple stakeholders. 69. The Working Group welcomes efforts to clarify obligations under international law and identify good practices, such as the Montreux Document, in addition to industry self-regulation initiatives, such as the International Code of Conduct for Private Security Service Providers. The Working Group urges States to recognize these initiatives as complementary to, but not substitutes for, strong international and national regulatory frameworks. 70. The Working Group reiterates its view that a comprehensive, legally binding international regulatory instrument is necessary to ensure adequate protection of human rights. The Working Group therefore encourages all States to participate actively in the work of the intergovernmental working group established by the Human Rights Council with a view to considering the possibility of an international instrument for the regulation of private military and security companies. 71. States should ensure investigation and prosecution of violations of international human rights law involving private military and security companies to guarantee accountability for human rights violations and provide an effective remedy for victims. 17