CDC paper. The company responsible for one of these poisonings is likely Oh Sweet Art, located in Palm Bay, Florida.
Their decorative “non-toxic” powders, which may contain up to 25% lead, are still available on Amazon (lol).
Modified the title to reflect what, specifically, is a problem with the cakes, so there’s no panic about every hunk of fondue.
Capitalism being the most efficient economic system ever™, as usual. It’s so much better to expect everyone engaged in toxicological, electrical, mechanical safety research than to have a trusted authority (gasp! Sounds like authoritarianism to me) impose on the blessed job creators.