Maybe you have one in your neighborhood: a dusty, dark building that's always standing on the verge of being condemned. They're a "business." What do they do? Do they even sell anything? Pay close attention next time you pay a visit. We're betting they're a drug front, a facade of a reputable business that only exists to launder money through. Keep this handy, and see how many of these tell-tale signs you can check off: 10 Ways to Tell If a Business Is a Drug Front.