Food borne disease remains a priority in the USA. Over the decades, measures to curtail it have actually resulted in a decrease in food related illness. Still, it is worth noting that there is always that chance; therefore, consumers have a personal responsibility for assuming precaution. After all, it is your health and you must take primary responsibility for safeguarding it.
There is no question that wholesale produce and fruit markets directly supplying restaurants don't pay much attention to the possibility of disease transmittal. They figure the buyers will eventually see to it that spoiled stuff is discarded by a manager or chef.
But is that always the case. Say the chef is under pressure to bring down food costs, for example, or there is an overly ambitious manager looking for a promotion (transfer from the frozen tundra to a unit in Florida) looking to impress the gang at HQ.
They start to take stupid risks and hope they can get over by overcooking spoiled food, for example, just to make sure the bacteria are destroyed. They hide spoiled fruit and veggies with fresher stuff. They spread cream sauces over crummy looking meats. They add extra vinegar to week old cole slaw. They save the hollandaise sauce with the cigarette butts and ashes and strain it and serve it the next day.
And the list goes on.
He looks at you like you owe him money.