The FDA and USDA do not require labeling of products containing genetically-modified foods.  It is up to the consumer to educate themselves.  For a shopper's guide to avoid GMO's download a PDF version from True Food Now:
http://truefoodnow.org/genetically-engineered-foods/shoppers-guide/

Information on chemicals in our food and cleaning products:
http://www.purezing.com/toxins.pdf