30. Urges States: (a) To develop and implement policies and action plans, and to reinforce and implement preventive measures, in order to foster greater harmony and tolerance between migrants and host societies, with the aim of eliminating manifestations of racism, racial discrimination, xenophobia and related intolerance, including acts of violence, perpetrated in many societies by individuals or groups; (b) To review and revise, where necessary, their immigration laws, policies and practices so that they are free of racial discrimination and compatible with States’ obligations under international human rights instruments; (c) To implement specific measures involving the host community and migrants in order to encourage respect for cultural diversity, to promote the fair treatment of migrants and to develop programmes, where appropriate, that facilitate their integration into social, cultural, political and economic life; (d) To ensure that migrants, regardless of their immigration status, detained by public authorities are treated with humanity and in a fair manner, and receive effective legal protection and, where appropriate, the assistance of a competent interpreter in accordance with the relevant norms of international law and human rights standards, particularly during interrogation; asdf United Nations 56