Jack Daniels, George Dickel and Collier & McKeel Tennessee whiskeys undergo a filtering stage called the Lincoln County Process, in which the whiskey is filtered through (or steeped in) a thick layer of maple charcoal before it is put into new charred oak barrels for aging.
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Finally, the United States has a long tradition of placing relatively strict limitations on its native forms of whiskey; particularly notable are the requirements for labeling a product "straight whiskey" and the requirement, enforced by federal law and several international agreements (NAFTA among them) that a product labeled Tennessee whiskey be a straight Bourbon whiskey produced in the state of Tennessee.