Yes, according to most experts on cereal chemistry and celiac disease. Scotch whiskey is made from barley, but gluten/gliaden do not distill into the finished product. Scientific tests cannot detect even traces of gluten in distilled spirits and vinegar.
Most dietary guildelines have been revised to reflect the scientific findings. The American Dietetic Association (ADA) "Manual of Clinical Dietetics" 6th edition, the Gluten Intolerance Group (GIG), and Celiac Disease Foundation (CDF) all list distilled grain spirits and vinegars as safe for people with celiac disease.
Only the Celiac Sprue Association (CSA) still lists distilled spirits and vinegar as questionable. It is unclear to doctors and scientists why the CSA maintains this position when distillation removes gluten so well that it is undetectable in the finished product.
http://www.csaceliacs.org/gluten_choices.php