Well since you bring it up: Olive oil is shipped across state lines. You obviously can't have 50 different labels for a product. This would fall under "providing for interstate commerce", which is a Constitutional requirement.
Thanks for playin'.
It's the statists final fall-back. That, and general welfare.
The founding fathers warned us about this.
/johnny
It happens but its a mess.
Some Southern states regulate what can be labeled "dolomitic limestone" and each state is different. Some require more than 30% magnesium, some less than 20%. What happens is "dolomitic limestone" often carries a hefty premium over the exact same thing labeled "magnesium carbonite". To make it worse, Organic Gardening touted "dolomitic limestone" years ago and it's become the gold standard for liming agents when the fact is some soils in the northeast (mine in particular) have too much magnesium. A lot of people pay too much because of these labeling laws.On the other hand, commerical growers in the south where soils are often lacking in magnesium, do need to know if the "dolomitic limestone" they are buying is 15% Mg or 36% Mg.