the capacity of testing agencies is limited leading to inconsistent enforcement that adds to uncertainty for foreign producers arita and dyck depending on the product these may include a certificate of free sale cfs from the competent authorities of the exporting country stating that the product is produced and freely sold in the country of origin in terms of agriculture the goods affected are mostly nonfood agriculture and fishery products but all products containing genetically modified materials products that were irradiated and products that were produced by new technologies require a cfs when imported to viet nam wto