5. (a) In cases in which the established investigative procedures are inadequate because of insufficient expertise or suspected bias, or because of the apparent existence of a pattern of abuse or for other substantial reasons, States shall ensure that investigations are undertaken through an independent commission of inquiry or similar procedure. Members of such a commission shall be chosen for their recognized impartiality, competence and independence as individuals. In particular, they shall be independent of any suspected perpetrators and the institutions or agencies they may serve. The commission shall have the authority to obtain all information necessary to the inquiry and shall conduct the inquiry as provided for under these Principles.Under certain circumstances, professional ethics may require information to be kept confidential. These requirements should be respected.
5. (a) 如果因缺乏专门知识或怀疑存有偏见，或因显然一贯存在滥用职权行为，或出于其他实质性理由，既定程序不足以完成调查，国家应确保通过独立调查委员会或类似的程序进行调查。选任的独立调查委员会成员应为公认为公正无私、具有能力和独立性的人。成员尤应独立于任何涉嫌实施此种行为的人及其可能服务的机构或机关。委员会应有权取得调查所需的一切资料并应根据这些原则的规定进行调查。在某些情况下，专业道德可能要求资料保密。这些要求应得到尊重。