You think this is bad, in order to get those extra long fries, Mcdonald's insists upon a particular variety of difficult to grow potato.
Said potatoes are plagued by a particularly difficult to deal with species of blemish causing insect. Since Mcd's also insists on a blemish free product, the farmers supplying them use a pesticide so potent, the picked potatoes are unfit for human consumption for a full six weeks after harvest. They must be kept in storage to offgass until then.
All in all, I'm not surprised their salads are health hazards too.