You can submit a sample. If you have a concern about the grade that's being issued at that particular elevator, you can in fact send that sample to the Canadian Grain Commission, and they will look at it and determine whether it is in fact the grade, the dockage, or whatever.
S'il a des inquiétudes au sujet du grade attribué, il peut soumettre un échantillon à la Commission canadienne des grains qui dira si l'échantillon correspond effectivement au grade attribué, s'il y a des impuretés, etc.