And that *has* happened under severe regulation as well, like that German organic farm which killed tenths of people a couple months ago.
Why is it so hard to see the dramatic difference between violently imposed regulations, what's every government regulation is, and voluntarily chosen regulations, or "certifications"? Isn't it obvious that the latter *will* work better? Since they need producers to choose to get certified, they can't impose arbitrary stupid rules like the ones we commonly see in state regulations, otherwise producers will boycott them. And consumers should be always free to choose between certified producers* or take the chances with non certified ones, or those with "unknown certifications". Why should the lady in this typical example be required to abide to strict rules if she only sells her ice cream locally, to people who know her? And even if somebody who doesn't know her is willing to take a chance, he should be free to do so.
Learn one thing: state regulations are there only to protect established industries against competition. It has nothing to do with protecting consumers.
Every law that slightly harms a large and disperse number of people while intensively benefits a small group of people will be approved. That's the basic rule of public choice, people won't even care to know about regulations that potentially harms them just a little, since the cost of even knowing about them is higher than the cost it imposes on them. It is a rational behavior not to know about these laws being approved. On the other hand, the small number of people which will largely benefit from the law will probably be among those writing it, and lobbying hard ($$$) to get it approved.
* Actually, IMHO in a true free market consumers possibly wouldn't even need to care about certifications, that would be handled before the retail. Consumers would only need to know in which retailers they trust, and good retailers would then require proper certifications from producers they don't fully trust. But maybe there would be consumer-oriented certifications as well, one can't predict that.