The tribunals shall not be bound by technical rules of evidence. They
shall adopt and apply to the greatest possible extent expeditious and
non-technical procedure, and shall admit any evidence which they deem to
have probative value. Without limiting the foregoing general rules, the
following shall be deemed admissible if they appear to the tribunal to
contain information of probative value relating to the charges:
affidavits, depositions, interrogations, and other statements, diaries,
letters, the records, findings, statements and judgments of the military
tribunals and the reviewing and confirming authorities of any of the
United Nations, and copies of any document or other secondary evidence
of the contents of any document, if the original is not readily
available or cannot be produced without delay. The tribunal shall afford
the opposing party such opportunity to question the authenticity or
probative value of such evidence as in the opinion of the tribunal the
ends of justice require.