我国精神病人犯法的数量居高不下,对社会的正常秩序造成诸多危害,给警方的工作带来很大的压力。这类案件通常须经司法精神病学鉴定,鉴定意见属法定的证据之一,对案件的处理结果有着重要的影响,但它不应当成为左右全案结局的垄断因素。经常以委托方身份出现的警方应当对鉴定意见所存在的问题和局限性有所了解,并积极地加以解决和克服,使之发挥正常的证据效力。在这类案件中,对于那些危害后果特别严重的案件应当移送法院审判。 The high number of mentally ill prisoners in our country has caused a great deal of damage to the normal order of society and put a lot of pressure on the work of the police. Such cases are usually subject to forensic psychiatry, appraisal opinion is a statutory evidence, the outcome of the case has a significant impact, but it should not become a monopoly factor around the outcome of the case. Police who often appear as the client should understand the problems and limitations of the appraisal opinions and actively solve and overcome them so that they can exert normal evidence validity. In such cases, cases of serious endangerment should be referred to the court for trial.