The architecture of international counterterrorism law is the subject of Chapter 2. It is a branch of public international law that has emerged from an evolving special legal regime to regulate action to prevent and punish terrorism and to tackle terrorists. International counterterrorism law is a matrix of global terrorism treaties and dedicated United Nations Security Council resolutions that require the incorporation of offences into domestic law combined with the salient rules of international humanitarian law and the law of law enforcement. These rules, which regulate when and against whom force may be used in counterterrorism, are supplemented by (though are sometimes inconsistent with) the content of regional treaties and domestic legislation. The standards and laws are subject to the constraints and oversight of international human rights law. The chapter also describes the content and adherence of regional counterterrorism treaties.