- Under college rules, if the defensive team gains possession and advances the ball the length of the field into the opposite end zone on the try (for example by an interception or a fumble recovery, or by blocking a kick and legally recovering the ball), they score two points. This is officially recorded as a touchdown scored by the defense. The NCAA adopted this rule in 1990.
- This scenario cannot occur under NFL or high school football rules; the ball is ruled dead and the try is over immediately when the defense gains possession.
I know it's Wiki
, but I'm too lazy to go through the NFL rule book.