If you've been browsing whiskey Reddit or your other choice of social media, you may have seen people referring to some whiskey as being "sourced". Sourcing simply means that the final brand or producer purchases the initial distillate from another company. There are a growing number of such "Non-Distiller Producers" (NDPs) in the US. Typically these NDPs will blend and bottle different distillates and may age or finish them as well. This is not a new concept as rectifiers (those who bought whiskey from producers and "rectified" it) have been around as long as whiskey has existed in America. Some of the biggest brands we know today started as rectifier companies, including Four Roses. On the other hand, bad actor rectifiers added adulterants and put out shoddy products, spurring the creation of the Bottled-In-Bond Act and other quality regulations. While we have replaced the term "rectifier" with "NDP" in the common parlance, the p...