The longest penalty in an NFL game is undefined. A defensive pass interference penalty is assessed from the line of scrimmage to the spot of the foul. If the spot of the foul is 30 yards beyond the line of scrimmage, the penalty is 30 yards. If the spot of the foul is 18 yards past the line of scrimmage, the penalty is 18 yards. If the spot of the foul is 9 yards past the line of scrimmage, the penalty is 9 yards. A defensive pass interference penalty is the only penalty that can be longer than 15 yards.
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