The US government often refers to "enhanced interrogation techniques" as a method to discuss torture without using that word.

The advantages of the medical torture is that it enhances the interrogation techniques. It makes the prisoners lack sleep and under stress that helps them disclose certain information.

The likely word is torture (to torment, or painful interrogation).

According to most experts, none.

It is generally accepted by the vast majority of practitioners of interrogation techniques that "torture" is ineffective because it simply causes the subject to give the answer they feel the interrogator wants to hear, whether or not it's the truth.

There are numerous psychological, chemical and even argumentative techniques that produce consistently more reliable results.

cruel or unusual punishment, or means of interrogation.