The U.S. Justice Department's CIA torture-tape probe is garbage except that it will be the FBI that will dig through much of the CIA's data. Nevertheless, that fox cannot guard the chicken coop. An investigation would have to be conducted by an independent council. Even then, there certainly is no guarantee. The Executive could fire that person if he or she is too effective.
This is all working within the fatally flawed system. The best thing is to come out and not partake.