Swiss Criminal Procedure Code

¹En­quir­ies may be made in­to the pre­vi­ous con­duct and the per­son­al cir­cum­stances of a wit­ness only if this is rel­ev­ant to an as­sess­ment of his or her cred­ib­il­ity.

²If there are doubts as to the men­tal ca­pa­city of a wit­ness or if there are in­dic­a­tions of a men­tal dis­order, the dir­ect­or of pro­ceed­ings may or­der an out­pa­tient ex­am­in­a­tion of the wit­ness if this is jus­ti­fied by the im­port­ance of the crim­in­al pro­ceed­ings and of the wit­nesses testi­mony.