LA Gear and other shoe companies have been using mercury to make the switch active in their shoe that light up when a person walks. The shoes should return to the company after the user is done with the to be recycled. Since LA never advertises this, people just thrown them away like any other pair of old shoes. Eventually the shoes end up in a land fill and the mercury can leak out into the environment. Mercury is a highly toxic substance and is the cause of the Minamata Disease in the 1950's. On the top 20 toxic chemical list, mercury rates 3rd. Mercury bioaccumulates in the body and has difficulty eliminating it. It may reach dangerous levels over tim