law: Indian Post Office Act, 1898 
  25. Power to intercept notified goods during transmission
  
  by post
  Where a notification
  
  has been published under section 19 of the Sea Customs Act, 187822,
  
  in respect of any goods of any specified description 23[or where the
  
  import or export into or from 5[India] of goods of any specified
  
  description has been prohibited or restricted by or under any other enactment
  
  for the time being in force], any officer of the Post Office empowered in this
  
  behalf by the Central Government may search, or cause search to be made, for
  
  any such goods in course of transmission by post, and shall deliver 24[all
  
  postal articles reasonably believed or found to contain such goods] to such
  
  officer as the Central Government may appoint in this behalf, and such goods
  
  may be disposed of in such manner as the Central Government may direct, 17[In
  
  carrying out any such search, such officer of the Post Office may open or
  
  unfasten, or cause to be opened or unfastened, any newspaper or any book,
  
  pattern or sample packet in course of transmission by post.]