text: FM 2-22.3_________________________________________________________________________________
  M-3. Careful consideration should be given prior to employing separation as
  an interrogation technique in order to mitigate the risks associated with its
  use. The use of separation should not be confused with the detainee-handling
  techniques approved in Appendix D. Specifically, the use of segregation
  during prisoner handling (Search, Silence, Segregate, Speed, Safeguard, and
  Tag [5 S's and a T]) should not be confused with the use of separation as a
  restricted interrogation technique.
  M-4. Members of all DOD Components are required to comply with the law of
  war during all armed conflicts, however such conflicts are characterized, and
  in all other military operations. Proper application of separation as a
  restricted interrogation technique in selective cases involving specific
  unlawful enemy combatants and in accordance with the safeguards outlined
  in this manual is consistent with the minimum humane standards of
  treatment required by US law, the law of war; and does not constitute cruel,
  inhuman, or degrading treatment or punishment as defined in the Detainee
  Treatment Act of 2005 and addressed in GPW Common Article III.
  M-5. Use of separation for interrogation is authorized by exception.
  Separation will be applied on a case-by-case basis when there is a good basis
  to believe that the detainee is likely to possess important intelligence and the
  interrogation approach techniques provided in Chapter 8 are insufficient.
  Separation should be used as part of a well-orchestrated strategy involving
  the innovative application of unrestricted approach techniques. Separation
  requires special approval, judicious execution, special control measures, and
  rigorous oversight.
  M-6. Additionally, the use of separation as a restricted interrogation
  technique shall be conducted humanely in accordance with applicable law
  and policy. Applicable law and policy for purposes of this appendix include
  US law; the law of war; relevant international law; relevant directives
  including DOD Directive 3115.09, “DOD Intelligence Interrogations, Detainee
  Debriefings, and Tactical Questioning”; DOD Directive 2310.1E, “The
  Department of Defense Detainee Program”; DOD instructions; and military
  execute orders including FRAGOs.
  M-7. More stringent than normal safeguards must be applied when using the
  separation technique. Use of separation is subject to USD(I) oversight.
  Compared to approach techniques, there are two additional steps in the
  approval process (see Figure M-l) for the use of the separation technique:
  • First, the COCOM Commander approves (after SJA review) use of the
  separation technique in theater.
  • Second, following the COCOM Commander's approval, the first
  General Officer/Flag Officer (GO/FO) in an interrogator's chain of
  command approves each specific use of separation and the
  interrogation plan that implements separation (this is non-delegable).
  Interrogation supervisors shall have their servicing SJA review the
  interrogation plan before submitting it to the GO/FO for approval.