 The National Rifle Association controversially lobbied for Holder to be held in contempt.In June 2012, a six-month-long investigation by "Fortune" magazine stated that the ATF never intentionally allowed guns to fall into the hands of Mexican drug cartels, in contrast to most other reports.Agents interviewed during the investigation repeatedly asserted that only one isolated incident of "gunwalking" ever occurred, and was performed independently by ATF Agent John Dodson (who later appeared on CBS News as a whistleblower to denounce the gunwalking scandal) as part of an unauthorized solo action outside the larger Fast and Furious operation.