After a forward pass has been completed, a player of Team A may interfere with an opponent anywhere within bounds. Prior to the pass being completed or declared incomplete, Team A may interfere with an opponent anywhere within bounds, provided that the pass is thrown to a receiver behind the line of scrimmage. If the pass is thrown to a receiver across the line of scrimmage, any interference that has occurred more than one yard beyond the line of scrimmage shall be ruled to have been illegal.
On a play from scrimmage in which the ball is kicked across the line of scrimmage, a player of Team A may interfere with an opponent up to one yard in advance of the line of scrimmage.
On any play from scrimmage, a Team B player may use his hands and arms to reach the ball carrier, but shall not hold or encircle any Team A player, other than the ball carrier.
On a play from scrimmage in which a forward pass is thrown, Team B players may, prior to the pass being thrown, use their hands and arms to ward off Team A players who, as potential blockers, threaten their defensive positions, but shall not be permitted to interfere with potential pass receivers who are not threatening those defensive positions.
After the pass is thrown, a Team B player shall not be permitted to interfere with a Team A receiver in an attempt to catch the ball.
The kicker or an onside player of Team A may not be contacted until reaching the line of scrimmage or until the ball has been touched by Team B.
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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 Senior Advisor, Football Operations @ firstname.lastname@example.org.