A document containing security images which enable original documents to be distinguished from copies of the originals. The host receives an identification credential of a user. The solid structure also includes a recess that receives the fiber pipe; and a step for receiving a sealing ring. Moreover, the workpiece is not immersed in an electrolyte so that contaminations of the workpiece caused by electrolyte are reduced. This invention can be used in internet multimedia database retrieval, digital library, video editing, surveillance and tracking, and other applications using face recognition and verification. The method includes detecting a voltage applied to a terminal of a transistor and coupling a biasing voltage to the body based upon the detected voltage.