This does not surprise me. The only surprise is that it did not happen sooner.  A few years ago I worked in the dispatch office of an agricultural trucking company.  I was shocked to find out that trucks that haul our food are also used to haul products that could contaminate the next load.  For example, a truck could be dispatched to a farm for a barn clean out where the truck is loaded with manure and then the manure is delivered to a composting facility.  The truck is then loaded with composted manure to deliver to an orchard.  Then the trailer is given a quick pressure wash inside and a bottle of Pine-Sol is splashed around to "sterilise" it.  Then the truck picks up a load of wheat and delivers it to a milling facility. From there is takes a load of waste for animal food.  The truck could be used to haul manure, ground glass, road salt, dead chickens, and anything else that can be unloaded by the trailer.  Trucks that haul food should only be used to haul food.