Skeptic and Twoblock:

Of course I am talking about obtaining a "true" cnfession. Skeptic writes that  there are some cops who are satisfied to get a confession from an innocent person and I guess that could be true, although I have never seen any indication of it.

Twoblock

Example: A police interrogator separates two suspects for questioning.  Each one is told that the other gave a statement implicating them both. The interrogator is lying and is an example of what I was referring to.