s 20
Every document purporting to be a warrant, order, direction or other instrument made or issued by the Minister or any other person in pursuance of any provision contained in or having effect under this Act and to be signed by him or on his behalf shall be received in evidence and shall, until the contrary is proved, be deemed to be an instrument made or issued by him. Protection to 21. Except as provided by this Act no suit, prosecution or acting under other legal proceeding shall lie against any person for anything in good faith done or intended to be done under this Act. Power to make regulations.