May be, I was just referencing the USDA labelling guideline for listing "Ground Beef" which happens to be the same as what 3body was posting.
Of course, I can't see where they call it Taco Meat Filling, unless it's just on their bags and such (the web site doesn't mention that). So since Taco Bell does not label anything in their menu as Taco Meat Filling, I don't see how that could be the issue at hand (could be wrong, though).
But, as I clarified above (you responded before I was done editing, dang it

), they use the term "Seasoned Ground Beef", which is also what is listed as the ingredient in their USDA approved labelling. No mention of Taco Meat Filling. Since we're discussing labelling guidlines, that makes me wonder. I think the news are, well, just inaccurate (suprise!) as I've found at least one that specifically referenced the gorund beef contention.
I think the main thrust is targetted at the ingredient list, because "beef" is listed as the primary ingredient, and if it does contain more filler than beef then this is incorrect, and would mean Taco Bell was in violation of USDA guidelines and procedures.