The July 31, 2008 Wine Spectator issue at page 15, in an article
titled U.S. Threatens to Block Brunello Imports, regarding the recent
accusations of fake Brunellos, says:
* * *
The TTB sent a follow-up letter informing the Italians that if the
matter is not resolved by June 9, the government would hold Brunello
Shipments unless "the importer submits a full and accurate statement
of contents verified by laboratory analysis, or a statement from the
government of Italy demonstrating that the product is made from 100%
Sangiovese grapes."
* * *

Is anyone aware of a "laboratory analysis" that can tell what grapes a
wine is made from"?