My hunch is the push to employ ever cheaper illegal immigrant labor...combined with Republican cut backs in inspections and food safety enforcment is causing all these food poisonings...
Eight years of Repubican domination of politics and the economy can do that sort of thing...! If you don't have to provide "port-a-potties" for the laborers...they have to piss somewhere...and it's probably on the lettuce in back of the truck!