Filed at 7:27 p.m. ET LOS ANGELES (AP) -- An environmental group sued chocolate manufacturers Wednesday, contending chocolate contains potentially hazardous levels of lead and cadmium and should carry warning labels. The suit, by the nonprofit American Environmental Safety Institute, alleges chocolate products expose consumers -- especially children -- to potentially dangerous levels of the metals. A state investigation last year discounted the lawsuit's claims, and U.S. Food and Drug Administration researchers have found children younger than 6 who eat lots of chocolate take in 6 percent or less of the total daily amount of lead allowable by law. An...