Born in OKC
You raise an interesting question, different rules in different states, though I’ve not heard of that before and wonder if the (Federal) Interstate Commerce legislation might prevent it. I don’t have a can of Wolfe Brand currently but will look next time I see one. And, it is even possible that the rules, if any, have changed, because I checked the can (which might have been months old at the time) several years ago after this thread first started.
Whether or not there is such a rule I personally don’t think that is the least attractive thing – at least at first glance – I’ve seen on packaged meats. I’d say that title goes to the "pork saliviary glands" I’ve seen on packages of Mexican style chorizo in Texas.
Maybe more than most folks I can rationalize eating anything that tastes good by thinking I’we probably eaten it in hoot dogs with no particular lable.
And the old butcher’s observation that heart adds good red color to ground beef was interesting. I’ve never heard that before.