精(jing)神(shen)疾病(bing)司(si)法鑒(jian)定(ding)的對(dui)象和任(ren)務是：判(pan)定(ding)當事人有(you)無；有(you)無責任(ren)能(neng)力(li)；判(pan)定(ding)確屬患者實施危害(hai)社會(hui)行為時，有(you)無辨認和控制能(neng)力(li)，有(you)無行為能(neng)力(li)。怎(zen)樣申(shen)請(qing)精(jing)神(shen)鑒(jian)定(ding)：提供(gong)被鑒(jian)定(ding)人曾經患病(bing)或可能(neng)患病(bing)的相(xiang)關依據(包(bao)括嫌疑人既往病(bing)史、家族(zu)病(bing)史等)即(ji)可申(shen)請(qing)精(jing)神(shen)鑒(jian)定(ding)。鑒(jian)定(ding)精(jing)神(shen)檢查場(chang)合有(you)時在醫院(yuan)，有(you)時選擇(ze)在、看守所、或當事人居住地。不(bu)(bu)同(tong)檢查環境的氣(qi)氛并不(bu)(bu)相(xiang)同(tong)，同(tong)時也影響鑒(jian)定(ding)人開(kai)展精(jing)神(shen)檢查的方式。

對于患者來(lai)說，情緒穩定(ding)時能夠進行正(zheng)常的(de)交流，如果(guo)突(tu)然發病是根本模仿不出來(lai)的(de)。司法鑒(jian)(jian)定(ding)不同于一般(ban)鑒(jian)(jian)定(ding)，它(ta)是由人(ren)(ren)針對人(ren)(ren)進行的(de)，人(ren)(ren)群(qun)存(cun)在個(ge)體差(cha)異，而鑒(jian)(jian)定(ding)過(guo)程需(xu)要主觀判斷，這時鑒(jian)(jian)定(ding)人(ren)(ren)員(yuan)的(de)經(jing)驗、知識就顯得(de)尤為重要，并且(qie)鑒(jian)(jian)定(ding)所依賴的(de)技術、設(she)備等，也同樣。人(ren)(ren)格(ge)(ge)量表(biao)，如今已經(jing)高度(du)標(biao)準(zhun)化，可信性也很高。判定(ding)的(de)是受(shou)測(ce)者的(de)基本人(ren)(ren)格(ge)(ge)類型。

司法鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)不同于一(yi)般(ban)鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)，它是由(you)人(ren)(ren)(ren)(ren)(ren)針對人(ren)(ren)(ren)(ren)(ren)進行的(de)(de)，人(ren)(ren)(ren)(ren)(ren)群(qun)存(cun)在(zai)個體差異(yi)，而(er)鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)過程需要(yao)主(zhu)觀判斷，這時鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)人(ren)(ren)(ren)(ren)(ren)員的(de)(de)經驗(yan)、知(zhi)(zhi)識就顯得尤為(wei)重要(yao)，并且鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)所依(yi)賴的(de)(de)技術、設備(bei)等，也(ye)同樣。案件(jian)的(de)(de)精(jing)(jing)神司法鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)，應當(dang)由(you)相應的(de)(de)辦(ban)案機(ji)(ji)關(guan)委托進行。案件(jian)的(de)(de)當(dang)事(shi)人(ren)(ren)(ren)(ren)(ren)、代理人(ren)(ren)(ren)(ren)(ren)、辯護代理人(ren)(ren)(ren)(ren)(ren)提出鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)要(yao)求的(de)(de)，精(jing)(jing)神鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)報價，應當(dang)向辦(ban)案機(ji)(ji)關(guan)提出申請，由(you)辦(ban)案機(ji)(ji)關(guan)決定(ding)(ding)(ding)(ding)(ding)，辦(ban)案機(ji)(ji)關(guan)同意的(de)(de)，由(you)辦(ban)案機(ji)(ji)關(guan)委托鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)。精(jing)(jing)神鑒(jian)(jian)(jian)定(ding)(ding)(ding)(ding)(ding)主(zhu)要(yao)還(huan)是依(yi)靠精(jing)(jing)神檢查（一(yi)般(ban)需要(yao)精(jing)(jing)神專科副(fu)主(zhu)任醫師及以(yi)上的(de)(de)資質），形(xing)式主(zhu)要(yao)為(wei)問診(zhen)，內(nei)容主(zhu)要(yao)涉及認(ren)知(zhi)(zhi)、情(qing)緒(xu)、意志、行為(wei)等方面，具體有評定(ding)(ding)(ding)(ding)(ding)細則。