Medical torture describes the involvement of, or sometimes instigation by, medical personnel in acts of torture, either to judge what victims can endure, to apply treatments which will enhance torture, or as torturers in their own right. Medical torture overlaps with medical interrogation if it involves the use of professional medical expertise to facilitate interrogation or corporal punishment, in the conduct of torturous human experimentation or in providing professional medical sanction and approval for the torture of prisoners. Medical torture also covers torturous scientific (or pseudo-scientific) experimentation upon unwilling human subjects.