In order to slow this trade, the FDA would have to target a major player in the complex shipping network, Amazon, by issuing a secret "untitled letter" or a public "warning letter" to Amazon CEO Jeff Bezos. In response to questions about Amazon, the FDA replied to me that Amazon has been the subject of consumer complaints, but that it has not been "the subject of any warning letter or enforcement action." The FDA did not explain why Amazon has not come under publicly revealed scrutiny and declined to comment on whether Amazon has been the subject of untitled letters, which are not public.