4. Each State Party shall take the necessary measures to prevent and sanction acts that hinder the conduct of an investigation. It shall ensure in particular that persons suspected of having committed an offence of enforced disappearance are not in a position to influence the progress of an investigation by means of pressure or acts of intimidation or reprisal aimed at the complainant, witnesses, relatives of the disappeared person or their defence counsel, or at persons participating in the investigation.
四、 各缔约国应采取必要措施，防止和惩处妨碍展开调查的行为。各缔约国尤应确保，涉嫌犯有强迫失踪罪的人不得利用其地位影响调查的进行，例如对投诉人、证人、失踪者亲属或他们的辩护律师，及参与调查的人员施加压力、恐吓，或实施报复。