law: Sashastra Seema Bal Act, 2007 
  108.  Presumption as to certain documents.
  1.       A
  
  letter, return or other document respecting the service of any person in, or
  
  the dismissal, removal or discharge of any person from, any unit of the Force,
  
  or respecting the circumstances of any person not having served in, or belonged
  
  to, any unit of the Force, if purporting to be signed by or on behalf of the
  
  Central Government or the Director-General, or by any prescribed officer, shall
  
  be evidence of the facts stated in such letter, return or other document.
  2.       A Force
  
  List or Gazette purporting to be published by authority shall be evidence of
  
  the status and rank of the officers, subordinate officers therein mentioned,
  
  and of any appointment held by them and of the battalion, unit, or branch of
  
  the Force to which they belong.
  3.       Where a
  
  record is made in any battalion book in pursuance of this Act or of any rules
  
  made there under or otherwise in the discharge of official duties, and purports
  
  to be signed by the commanding officer or by the officers whose duty it is to
  
  make such record, such record shall be evidence of the facts therein stated.
  4.       A copy
  
  of any record in any office of the Force purporting to be certified to be true
  
  copy by the officer having custody of such book shall be evidence of such
  
  record.
  5.       Where
  
  any person subject to this Act is being tried on a charge of desertion or of
  
  absence without leave, and such person has surrendered himself into the custody
  
  of any officer or other person, subject to this Act, or any unit of the Force,
  
  or has been apprehended by such officer or person, a certificate purporting to
  
  be signed by such officer, or by the commanding officer of the unit to which
  
  such person belongs or is attached, as the case may be, and stating the fact,
  
  date and place of such surrender or apprehension, and the manner in which he
  
  was dressed shall be evidence of the matters so stated.
  6.       Where
  
  any person subject to this Act is being tried on a charge of desertion or of
  
  absence without leave and such person has surrendered himself into the custody
  
  of, or has been apprehended by, a police officer not below the rank of an
  
  officer in charge of a police station, a certificate purporting to be signed by
  
  such police officer and stating the fact, date and place of such surrender or
  
  apprehension and the manner in which he was dressed shall be evidence of the
  
  matters so stated.
  7.     
  a.     
  
    Any document purporting to be a report under the hand of a
  
  Government scientific expert to whom this sub-section applies, upon any matter
  
  or thing duly submitted to him for examination or analysis and report in the
  
  course of any proceeding under this Act may be used as evidence in any inquiry,
  
  trial or other proceeding under this Act.
  b.    
  
    The Force Court may, if it thinks fit, summon and examine any
  
  such expert as to the subject matter of his report.
  c.     
  
    Where any such expert is summoned by a Force Court and he is
  
  unable to attend personally, he may, unless the Court has expressly directed
  
  him to appear personally, depute an officer who is conversant with the facts of
  
  the case to depose in the Court on his behalf.
  d.    
  
    This sub-section applies to the Government scientific expert,
  
  for the time being specified in sub-section (4 ) of section 293 of the
  
  Code of Criminal Procedure, 1973.