The article mentions that: > Because it can be difficult and expensive to keep sesame in one part of a baking plant out of another, some companies began adding

The article mentions that: > Because it can be difficult and expensive to keep sesame in one part of a baking plant out of another, some companies began adding small amounts of sesame to products that didn't previously contain the ingredient to avoid liability and cost. FDA officials said that violated the spirit, but not the letter, of federal regulations.