As I understand it, because the new law made it more either/or: those trace warnings aren't satisfactory, and they can't misrepresent what is in the product. So

As I understand it, because the new law made it more either/or: those trace warnings aren't satisfactory, and they can't misrepresent what is in the product. So they have to be sure sesame is in it if they're liable for saying it's not without a newly cost prohibitive means of assuring that.