Can’t the hashgacha agencies (i.e. OU-D, OK-D) effectively replace whatever the inspections the FDA did in Rav Moshe’s time that they no longer do?
After all, per Rav Moshe’s heter you could drink any milk in America even if it has no kashrus agency certification or inspection.
In fact, by the kashrus agencies inspecting and certifying the product, does that no suffice? Or did Rav Moshe indicate the food producers needed the fear of the government penalties for violating the law to make the heter effective?