In simple words, the RoHS directive is a European Union environmental regulation that took effect on July 1, 2006. It deals with not any average hazadous material, but only the worst of the worst, the evil of the evils, only 6 hazadous materials made it into the top wanted list, cadmium is one of them. Needless to say, the restriction and enforcement is very tough, bringing any offending business to their knees. The full text of RoHS is only 5 pages and is pretty clear. The last page lists a very short list of products that are exempt from the restriction. FSLR's CdTe solar panel does NOT make it to that short list.