Ivory: Can you hear me OK? generic tretinoin reviews One current federal prosecutor learned how agents were using SOD tips after a drug agent misled him, the prosecutor told Reuters. In a Florida drug case he was handling, the prosecutor said, a DEA agent told him the investigation of a U.S. citizen began with a tip from an informant. When the prosecutor pressed for more information, he said, a DEA supervisor intervened and revealed that the tip had actually come through the SOD and from an NSA intercept.