Conclusion
Custom poses challenges for its identification but at the same time it offers a potential for dynamism that may often be superior to that of treaty law. Recent developments, most importantly the near-universal ratification of major human rights treaties and the Universal Periodic Review mechanism of the Human Rights Council, greatly facilitate the identification of customary law. It is clear that most of the rights in the Universal Declaration of Human Rights are unquestionably part of customary international law. Doubts may persist about a few rights, such as the right to property. Customary law also extends to ‘solidarity rights’ or ‘peoples’ rights’, whose reflection in treaty law is not so universal. Recognition of rights does not ensure that there are effective mechanisms for their enforcement and implementation.