A food processing system is disclosed. The food processing system includes a food scaling portion, a food bagging portion and a chute portion connecting the food scaling portion to the food bagging portion. The food processing system also includes a foreign object sensor arranged about the chute portion. The foreign object sensor and the chute portion cooperatively form a foreign object sensing zone within a passage formed by the chute portion that extends along a portion of a length of the chute portion. The food processing system also includes at least one sensor testing conduit extending through one or both of the food scaling portion and the chute portion. An exit opening of the at least one sensor testing conduit is arranged in an opposing relationship with respect to the foreign object sensing zone. A foreign object sensor apparatus for detecting non-foodstuff material is also disclosed. A method is also disclosed.