Currently, there is no regulatory oversight for new chemicals in consumer plastic products, afaik. If someone develops a new plastic additive, do they have to

Currently, there is no regulatory oversight for new chemicals in consumer plastic products, afaik. If someone develops a new plastic additive, do they have to do any health testing with it before using it in commercial products? Do they have to do any analysis of the final product to see how that additive may have reacted with the other ingredients during manufacturing to make further novel chemicals? We could take the approach where it's illegal to sell plastics where the final manufactured product is not analyzed for constituents and rejected if novel untested constituents are found. This would certainly make plastic products more expensive, and take longer to bring new plastics to market, but I'm not sure that's necessarily a bad thing.