More than 20 private security firms are expected to sign an international code of conduct next month, as the controversial, fast-growing industry responds to a series of damaging setbacks. Companies that sign on to the industry-led effort at a Nov. 9 event in Switzerland will promise to respect human rights, properly screen security personnel and work to reduce civilian harm when working in conflict zones. Critics say the document amounts to little more than a public-relations campaign...Devon Chaffee, a lawyer with the advocacy group Human Rights First, said the code was a "potential good opportunity if it is accompanied by credible oversight."...Supporters say the code may help weed out fly-by-night operations...José Luis Gómez del Prado, who heads the Working Group on the Use of Mercenaries, a United Nations expert panel, said the self-regulatory approach of the code would fall short of being a real enforcement tool. [refers to Aegis Defence Services, EOD Technology, DLA Piper]