Intriago used his government connections to purge law enforcement files of information linking Castro Llanes to drug trafficking. He hired former US officials and investigators, who between 1991 and 1995 approached several different US government agencies for information. They eventually obtained DEA's intelligence files on Castro Llanes, and the names of at least four confidential informants against Castro Llanes for Customs. A former IRS agent working for Intriago found that some US$4 billion had passed through a Castro account in New York. He gave this information to US Customs agents and was fired by Intriago. New York District Attorney Robert Morgenthau linked Castro to 3,500 offshore corporations in Aruba, Curaçao, and elsewhere. The US$4 billion was never tied definitively to drug trafficking.