Four companies used to launder at least $20m for former Nigerian first lady Patience Jonathan have admitted their guilt in court.
Mrs Jonathan said the EFCC had hired mercenaries to plead guilty.
She has yet to reveal the source of $31.4m found in one account in Skye Bank, which she claimed as hers.
Treasury looting is a favourite pastime of most government functionaries in Nigeria, and few would account for their source of wealth.
