PART 2.2 The obligation of prevention is found in the major trafficking treaties including the Trafficking Protocol and the European Trafficking Convention. It is also affirmed through “soft law” sources including resolutions and policy documents of United Nations bodies and regional intergovernmental organizations and the work of the human rights treaty bodies and special procedures. These sources are cited throughout this section. 96 It is important to acknowledge that a human rights-based approach to trafficking may question or place limits on the use of certain commonly employed prevention strategies. The most important restriction in this regard is provided by the rule that responses to trafficking should not violate established rights (see the discussion under Principle 3 and related guidelines). The practical implications of this rule for prevention of trafficking are considered further below. RECOMMENDED PRINCIPLES AND GUIDELINES ON HUMAN RIGHTS AND HUMAN TRAFFICKING