Rules for pass interference differ between American and Canadian football:
In the NFL, the defender may make continuous contact with the receiver within the first five yards of the line of scrimmage. Anything after that is penalized as illegal contact. Pass interference is called if the defensive player contacts the offensive player while he is trying to catch the pass, unless the defender has turned his head to face the oncoming pass and is attempting to intercept it. Accidental, glancing contact is not penalized.
In high school and college, the defender may make contact with the receiver as long as the receiver is in front of the defender. These provisions end when the pass is in the air.
In the NFL, when a team presents a punt formation and before the ball is kicked, acts that normally constitute pass interference against the end man on the line of scrimmage or against an eligible receiver behind the line of scrimmage, who is aligned or in motion more than one yard outside the end man on the line, are not considered pass interference.3
In the NFL and the Canadian Football League (CFL) the penalty for defensive pass interference is an automatic first down at the spot of the foul. If the foul occurs in the end zone, the ball is placed at the one-yard line (or half the distance to the goal if the line of scrimmage was inside the two-yard line). In U.S. college football and amateur Canadian football, the penalty is an automatic first down at the spot of the foul, up to a maximum of 15 yards from the previous spot. In U.S. high school rules the penalty for both offensive and defensive pass interference is 15 yards from the previous spot with the down replayed. Prior to 2013, the penalty for defensive pass interference also included an automatic first down while the penalty for offensive pass interference included a loss of down. In the NFL and CFL, the penalty for an offensive pass interference is 10 yards from the previous spot. In amateur Canadian football, the penalty is 15 yards.
In certain situations a defensive player deliberately commits pass interference against an intended receiver who would surely make a huge gain or score a touchdown were he to catch the ball. This is especially true in NCAA and amateur Canadian football, where the penalty for pass interference that occurs more than 15 yards upfield is less severe than under professional rules. In U.S. high school, if the covering official deems the interference intentional rather than incidental, 15 additional yards may be assessed (although this is seldom called).4
"Pass Interference". Digest of Rules. National Football League. Retrieved 2010-01-01. http://www.nfl.com/rulebook/passinterference ↩
"Pass Interference". Digest of Rules. National Football League. Retrieved 2024-09-16. https://operations.nfl.com/the-rules/nfl-rulebook/#section-5-pass-interference ↩
2020 NFHS Football Rules Book. Rule 7, Article 10, Penalty: National Federation of State High School Associations. Retrieved 8 July 2021.{{cite book}}: CS1 maint: location (link) https://www.nfhs.org/activities-sports/football/ ↩