If the FDA website is current, then coffee liqueurs are fine: Here is a FAQ from the site (http://www.fda.gov/Food/IngredientsPackagingLabeling/FoodAdditivesIngredients/ucm233726.htm) :
Does this action apply to coffee-based liqueurs?
No. These Warning Letters are not directed at alcoholic beverages that only contain caffeine as a natural constituent of one or more of their ingredients, such as a coffee flavoring. The alcoholic beverages that are the subject of FDA’s Warning Letters are malt beverages to which the manufacturer has directly added caffeine as a separate ingredient.