law: Sashastra Seema Bal Act, 2007 
  102.  Documents exempted from production.
  1.       Nothing
  
  in section 101 shall be deemed to affect the operation of sections 123 and 124
  
  of the Indian Evidence Act, 1872, or to apply to any letter, postcard, telegram
  
  or other document in the custody of the postal or telegraph authorities.
  2.       If any
  
  document in such custody is, in the opinion of any District Magistrate, Chief
  
  Metropolitan Magistrate, Chief Judicial Magistrate, Court of Sessions or High
  
  Court wanted for the purpose of any Force Court, such Magistrate or Court may
  
  require the postal or telegraph authorities, as the case may be, to deliver
  
  such document to such person as such Magistrate or Court may direct.
  3.       If any
  
  such document is, in the opinion of any other magistrate or of any Commissioner
  
  of Police or District Superintendent of Police, wanted for any such purpose, he
  
  may require the postal or telegraph authorities, as the case may be, to cause
  
  such search to be made for, and to detain such document pending the orders of
  
  any such District Magistrate, Chief Metropolitan Magistrate, Chief Judicial
  
  Magistrate, Court of Sessions or High Court.