alt Hacker News> there is no legitimate reason for preemption to apply to labeling laws (even as broken as California's labeling law is), as labeling a product a certain way is not a mutually-exclusive action.
That's not really what preemption is about. A major point of having "interstate commerce" -- actual products crossing state lines -- at the federal level, is to prevent states from enacting trade barriers.
Suppose California disproportionately has more organic food producers and other states make higher proportions of food products grown with glyphosate. California then passes a law requiring the latter (i.e. disproportionately out-of-state) products to carry a scary warning label based on inconclusive evidence. Are they trying to enact a trade barrier? It sure looks like one. Meanwhile if the stuff is actually dangerous then it's dangerous in all 50 states, so the warning label should either be everywhere or nowhere according to the evidence, right?
Relatedly, having dozens or (at the city level) hundreds of different sets of rules is also a kind of trade barrier. Some small business in Ohio is willing to ship nationwide but every state has different rules, they might be inclined to cut off everyone who isn't in the local area since that's where they get most of their current sales, but that's bad. So then there is a legitimate interest in being able to say the rules have to be uniform if the states start trying to micromanage too much.
The better way to do this would be to only apply the interstate commerce rules to actual interstate commerce. So they could preempt California from requiring labeling on products shipped from Ohio, or require specific federal labeling on the things that are, but only California gets to decide about the things that never leave California. A lot of states would then say you have to follow the federal interstate rules even if you don't cross state lines, but it would be their decision and some might not.
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My point was specifically in regards to labeling, for which it's an awful stretch to call a trade barrier. If a label is "scary" enough to dissuade a potential purchaser, then it seems like the purchaser wasn't really informed about what they might have bought in the first place.
> So they could preempt California from requiring labeling on products shipped from Ohio, or require specific federal labeling on the things that are, but only California gets to decide about the things that never leave California
In my ideal world I'd slightly adjust the framing here. California law should apply to products that are being sold within California, regardless where they may have previously been (yes, that would be a complete repudiation of Wickard v Filburn's declaration that a butterfly flapping its wings is interstate commerce). A California distributor or retail store that gets shipments from Ohio but then sells locally should be required to follow California law about what they're selling, as those sales are occurring wholly in California. Also if Ohio and California can agree on something that differs from federal, then that should also take it out of federal preemption territory. But of Ohio and California cannot agree, and someone in California orders direct from Ohio, only then federal law should step in with preemption.
> Meanwhile if the stuff is actually dangerous then it's dangerous in all 50 states, so the warning label should either be everywhere or nowhere according to the evidence, right?
Only if other states or the federal government give that much of a shit about food safety, which is not a guarantee, both in theory and in practice. They might, for instance, care more about agri-profits than California does.
> So they could preempt California from requiring labeling on products shipped from Ohio, or require specific federal labeling on the things that are, but only California gets to decide about the things that never leave California.
That's just a regulatory-arbitrage race to the bottom. You'd just have out-of-state producers that don't have to follow any of your laws out-competing local ones.
More importantly in this case, a commitment to federal preemption allowed Congress to come to an agreement on a more ambitious set of federal regulations than would have been obtainable without it.