Best Answer - Chosen by Voters
Punt returner must run ball (or kick it out of end zone or concede a single point (rouge). The rule on unsuccessful field goals is similar in all these respects.
For example...
The kicking team is trying to punt for a single point. The punt goes deep into the end zone (which in Canada is 20 yards deep). The receiving team will have its 2 or 3 best punters in the end zone as the kick receivers, because the receiving team is allowed to punt the ball back out of the end zone, thus avoiding the single point. Usually they try to angle the punt out of bounds if time has expired.
Source(s):
http://www.stampeders.com/fan_guide/football_101/cfl_nfl/
http://wiki.answers.com/Q/What_are_the_points_you_get_for_CFL_football