Googled the baby formula, they said no import in the USA of baby formula... so tragic..
http://www.nytimes.com/2008/09/16/world/asia/16milk.html?ref=business
It was stated the melamine - a plasitics ingredient - it made the formula appear richer than it was... and it was also added to the pet food supply...
so how easy it would be to bulk up candy by throwing this ingredient into it!

However, I seriously doubt it has been added... because of the toxic nature, it will be found pretty quickly by consumers.
Also a family did a year without anything from China and wrote, or blogged about how hard it really was!! This one a googled to provide a link...
http://www.boston.com/business/articles/2007/07/19/my_year_without_made_in_china/