The Food and Drug Administration is building a legal case against companies that sell pure powdered caffeine. This summer, The FDA warned consumers to avoid pure powdered caffeine saying even a teaspoon of the powder can be lethal - it is equivalent to 25 cups of coffee. The powder has already been linked to two deaths this year. Caffeine powder is usually marketed as a dietary supplement and is unregulated, unlike caffeine added to soda. Since the FDA doesn't have the legal authority to just pull such a substance off the shelves, the agency is in the process of building a legal case against those who are marketing it in bulk in an attempt to persuade them to stop.