There's a wild book from 2006 called Overdose (by Richard Epstein), that makes a more or less libertarian argument for deregulation of the drug industry. What the book misses is that before the FDA and the Pure Food and Drug Act is that anyone who thought they could make a buck by poisoning as many people as possible did exactly that. And, especially given the "tort reform" prevalent in red states, there is fairly minimal disincentive for corporations to kill people in the US.