Prop 65 is frequently joked about but at the time it was a resounding success. The drawback is that any item being sold in California that doesn't pay for the extensive testing (to confirm it doesn't contain any of the thousand chemicals on the list from 1985), ends up carrying the label that the item might cause cancer. If Wikipedia is too dry for you, there's a podcast that explains the history and facts well https://99percentinvisible.org/episode/warning-this-podcast-...