Notary public

Definition and stakes

Executive Order 288½

“ It is hereby ordered that hereafter no officer, clerk, or employee in the executive service of the Government, who is also a notary public, shall charge or receive any compensation whatever for performing any notarial act for an officer, clerk, or employee of the Government in his official capacity, or in any matter in which the Government is interested, or for any person when, in the case of such person, the act is performed during the hours of such notary's service to the Government. ”
Source: Wikisource

John McLean,  Cookendorfer v. Preston — Opinion of the Court

“ A notary is a competent witness on the same ground that other agents are admissible. They are always responsible to their principals for gross negligence, and yet, from the necessity of the case, they are competent witnesses to prove what they have done in the name of their principals.
It appears that the witness, who generally acted as notary for the Bank of Washington, had given a bond, with security in the sum of ten thousand dollars, for the faithful performance of his duty as notary public, in the business of the bank committed to him.
”
Source: Wikisource

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