That's a very good question, and I don't have a clear answer for you. I think packaging is very important, along with education, to not leave cookies lying outside of a package, as that would obviously be appealing. Not using the type of packaging that a child might want to really get into is important.
In Colorado, we had to put in place some regulations after the fact. They can't be in the shape of humans or animals or fruits; that's a start. But finding where the best line is ultimately is difficult.