OPI is a really serious penalty in NFHS.
A few years ago in a JV game I had a receiver block a defender and another receiver came underneath and caught the ball. OPI!
When I reported it to the referee he said that was not a foul and the other official on the three man crew backed it up.
Point being, I think a large number of officials do not know the rule, therefore, teams get away with it all the time.
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