It surprises me that in China every product shows what quality standard it follows (e.g. YY0469 for surgical masks and GB2717 for soy sauce). Apparently all products for domestic sales are required to follow such standards and subject to auditing. Failures to do so is punishable by law. This effectively restricts the quality and cost of the product above a agreed minimum level.
Similar regulations is rarely observed in US. In US we often see certification as a enforcement or rating of quality and performance (e.g. DOT certified motorcycle helmit) but non-certified product are also allowed for sale.
But on the other hand, EPA, DoE, FCC do enforce product quality indirectly, e.g. by regulating environmental impact, smog emissions, energy efficiency and EMI/EMC.
I'm not sure why product quality regulations are not widely enforced in US. My best guess is it interferes with the free market, so I'm asking this question:
Is it constitutional for federal or state government agencies to directly enforce minimum product quality?
My rough research seems to indicate it is, e.g. USDA standard for dry whole milk
It contains not more than 5 percent by weight of moisture on a milk solids not fat basis and notless than 26 percent but less than 40 percent by weight of milk fat. It shall conform to theapplicable provisions of 21 CFR 131 “Milk and Cream” as issued by the Food and DrugAdministration.