text: FM 2.22.3 _________________________________________________________________________________
  DOCUMENT EXPLOITATION IN SUPPORT OF HUMINT COLLECTION
  I-50.Documents found on detainees, including EPWs––that can be exploited
  more efficiently when combined with HUMINT collection––are forwarded
  with the detainee to the next echelon in the EPW/detainee evacuation
  channel. In exceptional cases, documents may be evacuated ahead of the
  EPW or other detainee for advance study by intelligence units. A notation
  should be made on the EPW’s capture tag or accompanying administrative
  papers about the existence of such documents and their location if they
  become separated from the detainee.
  SOURCE-ASSOCIATED DOCUMENTS
  I-51.Documents captured on or in association with a human source play an
  important role in the HUMINT collection process. These documents may
  contain reportable information the same as with any other CED. The
  information is immediately extracted from the documents and forwarded in
  the appropriate intelligence report. In addition to reportable information,
  documents (in particular personal documents) may provide valuable insight
  into the attitude and motivation of the source and can be effectively used by
  the HUMINT collector in the approach process (see Chapter 8). Guidelines
  for the disposition of the detainee's documents and valuables are set by
  international agreements and discussed in more detail in AR 190-8 and
  FM 19-4.
  I-52.The capturing unit removes all documents, with the exception of the
  source's primary identification document, from an EPW or other detainee to
  prevent their destruction. These are placed in a waterproof container
  (usually a plastic bag) and Part C of the capture tag is placed in the bag.
  Documents from each source should be placed in a separate bag. These
  documents are turned over to the first MP EPW handling unit in the chain of
  command. The MPs will inventory all documents and prepare a handreceipt
  and provide a copy to the EPW or detainee.
  I-53.To ensure proper handling and expeditious disposition of these
  documents, the first HUMINT collection element to see the detainee should
  review the documents as part of the source screening process. If an official
  document is confiscated and evacuated through MI channels, the HUMINT
  collector must obtain a receipt for that document from the MPs. If possible,
  the HUMINT collection unit copies any documents that contain information
  of intelligence interest and forwards the copies through MI channels. With
  the exception of an identification document, documents are normally kept
  separate from the detainee until the detainee arrives at a permanent
  confinement facility, at which time documents are returned to them per AR
  190-8.
  I-54.Three possible actions may be taken with documents captured with a
  source. The documents may be confiscated, impounded, or returned to the
  source.