The Public Service Commissioner says he doesn't think officials involved in an MBIE border biometrics project still work there.
Reviews are being launched into allegations immigration staff tried to avoid Cabinet scrutiny of a cost blowout.
At least $32 million was wasted over seven years.
Sir Brian Roche says investigations include looking at current staffing.
"This is a serious problem for us and I have to get the assurance that it's not happening across the system - we cannot function as a public service when we don't have the confidence and trust of ministers."
LISTEN ABOVE

Chlöe Swarbrick: Green Party co-leader on the Greens pushing for a Parliamentary Budget Office political aisle
05:29

Lucy Spoors: Olympic rower on World Athletics launching a project to study elite female athletes after having children
02:44

Charles Croucher: Nine News chief political editor on Pauline Hanson delivering her first National Press Club address
03:34