 In March, he was hired as a confidential informant working with the ATF's Tucson office, part of their Phoenix, Arizona field division.With the use of surveillance equipment, ATF agents monitored additional sales by Detty to straw purchasers.With assurance from ATF "that Mexican officials would be conducting surveillance or interdictions when guns got to the other side of the border", Detty would sell a total of about 450 guns during the operation.