That is kind of early-90s Seattle (4 kids died, was working for McDonalds at the time), has Jack in the Box killed a bunch more people more recently that you are referring to?
No but this is why In&Out wants to control/restrict delivery, to prevent people getting sick and suing them. Delivery guy could have Shigella or something, handles your food (eats a fry say) and you get sick. You blame In&Out. In fact he delivers 100 In&Outs all ordered from same place. Delivery guy is the vector but In&Out gets the blame.
If it had, it would totally have been in the news. That I knew what parent was talking about exactly goes to show that they don't happen that often. I'm not really a fan of Jack in the Box, but 1993 is when I graduated HS, for crying out loud.