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Public officer privilege
A public officer cannot be examined during his term of office or
afterwards, as to communications made to him in official
confidence, when the court finds that the public interest would suffer
by the disclosure.(Rule 130 Sec. 24(e)

1. That it was made to the public officer in official confidence
2. That public interest would suffer by the disclosure of such
   communication, as in the case of State secrets.

Where no public interest will be prejudiced, this rule will not apply.

Public Interest
something in which the community at large has some pecuniary interest
by which their legal rights or liabilities are affected.