law: The Prevention of Terrorism Act, 2002
  27. Power to direct
  
  for samples, etc.-
  1.  When
  
  a police officer investigating a case requests the Court of a Chief Judicial
  
  Magistrate or the Court of a Chief Metropolitan Magistrate in writing for
  
  obtaining samples of handwriting, finger-prints, foot-prints, photographs,
  
  blood, saliva, semen, hair, voice of any accused person, reasonably suspected
  
  to be involved in the commission of an offence under this Act, it shall be
  
  lawful for the Court of a Chief Judicial Magistrate or the Court of a Chief
  
  Metropolitan Magistrate to direct that such samples be given by the accused
  
  person to the police officer either through a medical practitioner or
  
  otherwise, as the case may be.
  2.  If
  
  any accused person refuses to give samples as provided in sub-section (1), the
  
  Court shall draw adverse inference against the accused.