From the Bureau Veritas Group:
The state of Wisconsin has passed a law banning bisphenol A (BPA) in child’s containers. In addition to the ban on BPA, the law also includes a requirement that all product that complies with the ban must be labeled as not containing the chemical. This law becomes effective as of June 15, 2010 and applies to manufacturer’s and retail inventory, as well as new product being produced or sold.
For additional information follow the link above.