See The DSS Report That Got Magu Rejected As EFCC Chairman (DOCUMENTS)

The Senate rejected Magu's nomination following a letter by the Department of State Services (DSS) which upheld an earlier letter that Magu failed the integrity test and was unfit for the office.
The DSS letter which was sent to the Senate on Wednesday stressed that Mr Magu would constitute “a liability to the anti-corruption fight of the present administration”.

Photos of the letter below;