from that of other leagues, being most similar to that used in US college football after that rule set's fourth overtime procedure: Overtime consisted of a five-round "shootout" of two-point conversion attempts. No coin toss was used to determine the first possession—the visiting team started all rounds on offense. The defense could not score on a conversion attempt. The first defensive penalty against a team during a round resulted in the ball being moved to the 1-yard line. A second defensive penalty in that round resulted in a score being awarded to the offensive team. Pre-snap offensive penalties were enforced according to regular rules. Post-snap offensive penalties ended that side's offensive round, with no score. All five rounds were played unless one team attained an insurmountable lead. If the game was still tied after five rounds, extra rounds were played until the tie was broken. Other differences In American high school and college football, as well as at all levels of Canadian football, receivers need only have one foot in bounds (provided the player's other foot does not come down out of bounds until the catch is made) for a catch to count as a reception. NFL play requires receivers to get both feet on the ground and in bounds after making the catch for a reception to count. Up through the 2007 season, an NFL official could award a catch if it was judged that the receiver would have come down in bounds if he had not been pushed by a defender. This rule was based on a judgment call by the official, and was criticized for being inconsistent. The rule was dropped prior to the 2008 season by the NFL. In Canadian football, defensive pass interference may be called on any legal forward pass, even when the receiver is behind the line of scrimmage. Pass interference rules in all levels of American football do not apply until the thrown ball crosses the neutral zone. Until 2010, when a forward pass was deemed to be "uncatchable", defensive interference with the intended receiver was penalized in Canadian football. This rule was dropped for 2010, bringing it in line with long-standing practice in American college and professional football. CFL roster sizes are 46 players (rather than 53 as in the NFL, though only 45 will dress for a game). A CFL team may dress up to 44 players, composed of 21