To which I reply--in appeal to the Christians of South Dakota, at least--the scriptures condemn those who make poisons to kill other people for profit. Why then should we offer them a special protection here in our state?
The answer appears to be that if the producers' names become public, they may be shamed into no longer selling human-killing drugs. What they do may be legal, but let them at least face the scrutiny of the marketplace.
If you're ashamed of what you sell, maybe you shouldn't sell it any more.
Unless you're Mossynoecians, that is. The Mossynoecians are mentioned in several ancient texts, notably Xenophon's Anabasis and Apollonius Rhodius' Argonautica. They surprised Greek visitors because they regarded love and procreation to be public goods that could be practiced outdoors, while they regarded commerce to be dirty and shameful, something to be practiced indoors. But I take it South Dakota is more like the Greeks than the Mossynoecians.