Right, because the "bad" chemical will be in CA, harming CA residents. CA can't say "the factory that made these chips emitted chemical X into the air during m

Right, because the "bad" chemical will be in CA, harming CA residents. CA can't say "the factory that made these chips emitted chemical X into the air during manufacturing, but none of it is in the final product", so you can't import it. The Federal Government can, but not an individual state.