above suspicion

The chair added: "The appearance of unethical conduct by a Commonwealth Games Federation official, which raised concerns by others who were present is like the proverb, 'Caesar's wife must be above suspicion'. Not only do Commonwealth Games Federation officials need to have integrity; they need to be examples of integrity and ethical conduct and avoid negative scrutiny or attention."

In other words they, as in the time-honoured adage about Caesar’s wife, must be above suspicion.

Mudd solved his problem by sending his cousin George, a loyal Unionist and therefore above suspicion by the federal authorities, to town to report Booth’s visit to Mudd’s farm.

The fiction that the nine Justices are above being policed is paramount—the Justices were questioned in the investigation of the leak, but it was deemed unnecessary to ask them to sign sworn affidavits—and the public is asked to trust they are above suspicion.

Further, it’s not as if the justices are above suspicion.