Prop. 65 hazard signs arouse controversy [...] several years ago, many of the treats were found to contain high and undisclosed doses of lead, which can cause learning disabilities, behavioral problems, seizures and even death in young people. In 2004, the Center for Environmental Health, an Oakland watchdog group, and other groups used a unique California law to sue major manufacturers for producing the toxic candies. The basis for the suit was Proposition 65, a 1986 voter-approved law that sets disclosure requirements for products that contain significant levels of chemicals known by the state to cause cancer or reproductive harm. Over the past two decades, Prop.