 Later that month, documents showed that some ATF agents discussed using Fast and Furious to provide anecdotal cases to support controversial new rules about gun sales.The regulation, called Demand Letter 3, would require 8,500 firearms dealers in Arizona, California, New Mexico and Texas that "have a significant number of crime guns traced back to them from Mexico" to report multiple rifle sales.Investigations by Congress and the DOJ Inspector General continued into 2012.