The SEC's fraud charges may be the least of accused financial scammer R. Allen Stanford's worries. Federal authorities tell ABC News that the FBI and others have been investigating whether Stanford was involved in laundering drug money for Mexico's notorious Gulf Cartel.
Authorities tell ABC News that as part of the investigation, which has been ongoing since last year, Mexican authorities detained one of Stanford's private planes. According to officials, checks found inside the plane were believed to be connected to the Gulf cartel, reputed to be Mexico's most violent gang. Authorities say Stanford could potentially face criminal charges of money laundering and bribery of foreign officials.