The government has all the rights. The comoanc operaatws under permission from the state, and has to follow all laws and regulations set out by the state.
Otherwise, what is stopping a company simply putting a poison in food and killing millions of people? If companies could do what they want it would be disaster.
It's more likely that they would add addictive substances than deadly poison. The former is much more profitable than the latter. Poisons would probably be added only when they cut production costs and probably wouldn't kill many people quickly and in a provable way.
I'm sure some people will think I'm talking nonsense and companies wouldn't do that. Those people should study history a bit more, because there were companies doing exactly that before regulations were enforced and it gave them a major competitive advantage over companies that didn't.