In the United States, environmental and health experts state that of the more than 84,000 chemicals on the market today, only about 200 have been tested for their effects on children.

http://www.parentdish.com/2010/10/26/the-senate-halloween-special-toxic-tales-of-tainted-tots/
http://edition.cnn.com/2010/HEALTH/10/26/senate.toxic.america.hearing/index.html