证据的合法性实际上对证据有三个不同层面的要求：（１）须符合宪法的要求。例如，我国宪法第三十七条规定：“中华人民共和国公民的人身自由不受侵犯。任何公民，非经人民检察院批准或者决定或者人民法院决定，并由公安机关执行，不受逮捕。禁止非法拘禁和以其他方法非法剥夺 The legitimacy of the evidence actually requires three different levels of evidence: (1) it is subject to constitutional requirements. For example, Article 37 of China’s Constitution stipulates: "The personal freedom of the citizens of the People’s Republic of China shall not be infringed. Any citizen, without the approval or decision of the People’s Procuratorate or the people’s court, shall be executed by the public security organ without arrest. Detention and unlawful deprivation by other means