[saint_fiasco]

The very fact that a company makes a cool commercial is a signal that they are willing to invest a lot of money to make their brand known. From there, people can infer that they won't just make their customers sick, change their name and location to escape the bad reputation, and do the same thing again somewhere else.

Poor people sell food to each other all the time without formal credentials, certifications, inspections and so on. Since they sell to each other, locally, to people who know them, they will only make each other sick on accident. And if someone has lots of accidents people will switch to a better cook. The amount of food poisoning will increase, but not to epidemic levels.