SNIF-NMR is the official method of the OIV to determine the authentication of wine origin. It is the only method to detect C3 sugar addition (like beet sugar).
The isotopic parameters of both water and ethanol are related to the humidity and temperature of the growing region of the plant. Therefore, considerations of meteorological data of the region and of the year help to make a diagnosis. In the case of wine and fruits, the isotopic parameters of ethanol have been shown to respond even to subtle environmental variations and they efficiently characterize the region of production,.
Since 1991, an isotopic data bank is built in the Joint Research Centre of the European Commission (EC-JRC) concerning wines of all European members. The database contains several thousand entries for European wines  and is maintained and updated every year. This database is accessible for all official public laboratories. Private companies involved in food and beverage controls have also collected authentic samples and built up specific data banks.
Thus, by comparing the specific natural isotope fractionation corresponding to each site of a molecule of ethanol of wine with that of a molecule known and referenced in a database.  The geographical origin, botany and method of production of the ethanol molecule and thus the authenticity of wine can be checked.