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from the CRC website
http://www.crcweb.org/liquor_list.php#Scotch
Scotch
Due to rapid changes in the scotch industry, and the cRc goal of relaying the most accurate kashrus information possible, the cRc is temporarily not listing any particular brand of scotch as being acceptable or not recommended. If you wish, in the mean time, you may determine the kosher status of a particular scotch by checking the label and packaging of each particular brand, type and vintage and ascertain that it was not produced using any possible questionable methods. Some questionable methods include scotch aged in wine casks such as sherry or port, dual casks, French casks or European casks. We hope to have this rectified soon and once again have an expansive scotch list available on our website.