Perhaps his most original contribution was his study and application of terrorism and torture as it related to this "Modern Warfare". He argued that it was immoral to treat terrorists as criminals, and to hold them criminally liable for their acts. In his view terrorists should be treated as soldiers, albeit with the qualification that while they may attack civilian targets and wear no uniform, they also must be tortured for the very specific purpose of betraying their organization. Trinquier's criteria for torture was that the terrorist was to be asked only questions that related to the organization of his movement, that the interrogators must know what to ask, and that once the information is obtained the torture must stop and the terrorist is then treated as any other prisoner of war. (See Chapter 4 of "Modern Warfare").