Proposition 65 is a California state law and cannot be enforced on companies that do businesses outside of the state of California. The state can only enforce the law were companies ship and/or sell their products in California. Many companies that are required to place these warnings on their products sold in California are not required to do the same when they sell in other states. While companies that do not do business in California are not required to add the warning notices on their products, many do anyway to avoid possible litigation. If a product that is intended for sale outside of California makes it into the state of California without a warning label, it becomes subjected to Proposition 65.