Here is the US Court judgement linking buhari's wife with Halliburton scam

 The governor’s Special Assistant on New Media, Lere Olayinka,  circulated links  and copies of the court document detailing Mrs Buhari’s mention in the scandal.
The documents showed that in some of the exhibits tendered in convicting Mr. Jefferson of bribery, a Mrs. Buhari was mentioned as transferring $170,000 to the American politician using a firm as proxy.

“Government Exhibits 36-87 (6/26/02 $170,000 wire transfer from account in Nigeria in the name of Aisha Buhari to an account in the name of The ANJ Group, LLC, identifying “William Jefferson” as Beneficiary),” the U.S. Government Sentencing Memorandum said on page 22.More.....