Business interests argue against a regulation requiring restaurants to list the allergens in each food product.

Usually the problems they cite are real, but exaggerated.

Every regulation that is implemented locally carries a risk of inducing businesses to move elsewhere. However, this is often much smaller than businesses claim. In some cases, we can and should avoid that problem by adopting the regulation for a broader region. But if the only possibility is to apply it locally, that may still be better than nothing.

Small exceptions can make a regulation much easier to obey. It would make sense to exempt specials that are offered for less than a week. I hope the regulation permits a restaurant to address the cross-contamination issue by saying, "this dish contains shrimp and may have traces of fish".