@MJT--I agree with you. I think that this is a foul in many cases. It is one of many classic examples of "rerouting" a receiver. Defensive coaches teach this all the time. However, the debate rages among officials as to what action is and is not legal with regards to this rule. Holding and DPI (when the ball is in the air) is easy. But talk about this rule in a group and I promise there will be no shortage of conflicting opinions and philosophies. And unfortunately there is very little supervisor-type training tape clips to settle the matter. (Please point me in the right direction if you know where I can get some.)
What do you have when a TE or a slot releases and runs a 5-yard drag route across the middle and an LB who has dropped back into pass coverage comes up and chucks him on the side (not a PF or in the back) as he's looking back to the QB? Some officials will say that because he was not at the same yard line that this is not a foul. They state that he is still a potential blocker even though the receiver is looking back toward the ball. They say this is "just football." Other officials say this is a foul. They cite that the "same yard line" clause is only part of the equation because 1) the rule states "...OR could not possibly block [the defender]" and 2) if you allow this contact, you essentially take away the passing game.
Again, assume contact that is not a PF, IBB or holding, you could literally knock receivers down as they make their cut all day long and without this rule, this is not a foul. Yet it has been my experience that officials are clearly divided as to whether that action is even a foul in the first place for the reasons I just stated.
What if you have a WR that runs a quick slant and gets chucked hard in the side on the shoulder pad by the corner as he's (the WR) looking back for the ball? Even though they're not on the same yard line, how can the WR be considered a potential blocker if he's running at an angle away from the DB? Yet we allow this all the time with no flag.
Is it reasonable to state that an LB gets a little more leeway on a chuck across the middle because he's keying the QB and a different colored jersey is running at/near him from the side as opposed to a CB that knows exactly what's happening when the WR breaks to the inside?
I have been told by defensive coaches that they coach their LBs to "go up and hit any receiver that crosses in front of you."
The NFL has solved a lot of this interpretation with their Illegal Contact rule. That's fine as that's what they want in their code. The question is what the NCAA (and even the Fed) wants in their code.
I'm certainly not trying to be over-technical, just trying to understand and hopefully work toward some sort of consensus.
Either way, I believe this is not called more often because we don't have a clear understanding of the rule than based on our judgment of the action that we observe.
Thoughts?