This idea was presented at Usenix LISA a few years back. "Two-Person Control Administration: Preventing Administation Faults through Duplication" by Shaya Pott

This idea was presented at Usenix LISA a few years back. "Two-Person Control Administration: Preventing Administation Faults through Duplication" by Shaya Potter, Steve Bellovin, and Jason Nieh https://www.usenix.org/conference/lisa-09/two-person-control-administration-preventing-administation-faults-through https://www.usenix.org/conference/lisa-09/two-person-control... The video isn't there for some reason, but the paper and audio of the presentation are.