This is from the NFHS Handbook Page 66 "The crackback block can be legal and it can be a very effective offensive weapon. It requires finesse and skill. The defense must be protected from its illegal use, however."
"Officials use established guidelines to determine whether a crackback block is legal.... If the offensive player's upper body contacts the front or the side of the the defensive player above the waiset, the block is undounbtably legal."...
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