Each year the Alcohol and Tobacco Tax and Trade Bureau (TTB) tests a random sampling of alcoholic beverages available throughout the U.S.
Known as the Alchol Beverage Sampling Program, in 2013 TTB testing found nearly 30% of labels contained inaccurate alcohol content claims. That adds up to 190 incorrect labels out of the 668 total products tested across the distilled spirits, wine, and malt beverage market - including 80 mislabeled distilled spirits out of 275 tested.
According to the TTB, “The results of our sampling program over the past few years indicate that proofing and gauging of distilled spirits is a problem area for some industry members.”
For now, it sounds like the TTB's approach will be to raise awareness and provide resources to help remedy the problem.