law: Indian Evidence Act, 1872 
  10. Things said or done by conspirator in reference to
  
  common design
  Where there is
  
  reasonable ground to believe that two or more persons have conspired together
  
  to commit an offence or an actionable wrong, anything said, done or written by
  
  any one of such persons  in reference to their common intention, after the
  
  time when such intention was first entertained by any one of them, is a
  
  relevant fact as against each of the persons believed to be so conspiring, as
  
  well for the purpose of proving the existence of the conspiracy as for the
  
  purpose of showing that any such person was a party to it.
  Illustration
  Reasonable ground
  
  exists for believing that A has joined in a conspiracy to wage war against the 11[
  
  Government of India]
  The facts that B
  
  procured arms in Europe for the purpose of the conspiracy, C collected in
  
  Calcutta for a like object D persuaded persons to join the conspiracy in
  
  Bombay, E published writings advocating the object in view at Agra, and F
  
  transmitted from Delhi to G at Kabul the money which C had collected at
  
  Calcutta , and the contents of a letter written by H giving an account of the
  
  conspiracy, are each relevant, both to prove the existence of the conspiracy,
  
  and to prove A’s complicity in it, although he may have been ignorant of all of
  
  them, and although the persons by whom they were done were strangers to him,
  
  and although they may have taken place before he joined the conspiracy or after
  
  he left it.