The proliferation of private security companies has received increasing public and academic attention in recent years. From the involvement of private security firms in Sierra Leone and Angola to the capture and killing of Blackwater security contractors in Iraq, the emergence of an international private security industry raises new questions with regard to the legitimacy of the private use of armed force. One aspect often missed in the
public debate has been the pervasiveness of private security contractors. While most reports focus on the controversial actions of private security firms in international interventions, most notably Afghanistan and Iraq, domestic private security sectors in Europe and North America have been expanding since the 1970s. The emergence of a global private security industry thus appears to be part of a broader trend that suggests
the growing acceptance and use of commercial security firms at the national and international levels. The recent signing of the Montreux Document on Pertinent International Legal Obligations and Good Practices for States related to Operations of Private Military and Security Companies during Armed Conflict has been a further expression of the increased legitimacy of private security contractors. In the document, seventeen states - Afghanistan, Angola, Australia, Austria, Canada, China, France, Germany, Iraq, Poland, Sierra Leone, South Africa, Sweden, Switzerland, Ukraine, the United Kingdom and the United States - have resisted pressures to strengthen the international regulation of private security firms by reiterating the applicability of existing international humanitarian and human rights law and by recommending that firms adopt a voluntary code of good practice