Interference takes place when a player obstructs, blocks, screens or charges towards an opponent, with or without direct contact, in such a manner that prevents the opponents approach to the ball carrier, potential ball carrier or the ball. Blocking is identified as the act of creating interference with contact.
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The CFL Official Rule Book is published annually by the Canadian Football League. Any inquiries regarding the CFL Official Playing Rules may be directed to George Black at gblack@cfl.ca.