I too have been around awhile and have seen the intentional PI called. As previously stated, it is most certainly warranted when a player stops defending against the pass and goes for the opponents legs to keep him from the ball. There are two specific parts to this situation. The intentional aspect of pass interference is considered an unsportsmanlike foul, which by rule, is enforced from the succeeding spot, ie., after the pass interference penalty, if accepted, is marked off. The administration of the penalties would be to signal pass interference and walk off 15. Then signal unsportsmanlike (signal 27) and walk off the second 15, assuming half the distance is not a factor.
This carries an automatic first down.
Also, keep in mind that this penalty pertains to offensive PI as well as the defense. For offensive PI you would have 15 + 15 and loss of down.
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