text: _________________________________________________________________________________FM 2-22.3
  Repeat Questions
  9-9. Repeat questions ask the source for the same information obtained in
  response to earlier questions. They are a method to confirm accuracy of
  important details such as place names, dates, and component parts of
  technical equipment and to test truthfulness. Repeat questions should not be
  exact repetitions of an earlier question. The HUMINT collector must
  rephrase or otherwise disguise the previous question. The repeat question
  also needs to be separated in time from the original question so that the
  source cannot easily remember what he said. Repeat questions may also be
  used to develop a topic the source had refused to talk about earlier.
  Control Questions
  9-10. Control questions are developed from recently confirmed information
  from other sources that is not likely to have changed. They are used to check
  the truthfulness of the source's responses and should be mixed in with other
  questions throughout the questioning. If a source fails to answer a control
  question as expected, it may be an indicator that he is lying. However, there
  are other possible explanations. The source—
  • Could have misunderstood the question.
  • Could be making up information in order to please the questioner
  and/or receive a promised incentive.
  • Could have answered the question truthfully to the best of his ability,
  but his information could be wrong or outdated.
  • May be correct and the information that the control question was
  based on is no longer true.
  9-11. It is the responsibility of the HUMINT collector to determine, through
  follow-up questions, which of the possibilities is the case. The HUMINT
  collector should also consult with the HAT for assistance in verifying the
  source reporting through all-source analysis.
  Prepared Questions
  9-12. Prepared questions are questions developed by the HUMINT collector,
  normally in writing, prior to the questioning. Prepared questions are used
  primarily when dealing with information of a technical nature or specific
  topic, which requires the HUMINT collector to formulate precise and detailed
  questions beforehand. The HUMINT collector may have to research
  analytical or technical material or contact SMEs to assist him in preparing
  questions. HUMINT collectors must not allow the use of prepared questions
  or any limitations to their education or training to restrict the scope and
  flexibility of their questioning. In many instances, the HUMINT collector
  should have an analyst or technical expert “sit in” on the questioning as well.
  9-13. The HUMINT collector must be able to use the different types of
  questions effectively. Active listening and maximum eye-to-eye contact with
  the source will provide excellent indicators for when to use follow-up, repeat,
  control, and nonpertinent questions. The HUMINT collector must use direct
  and follow-up questions to fully exploit subjects pertinent to his interrogation
  objectives. He should periodically include control, repeat, and nonpertinent