§ 26 O.S. § 26-14-108Return of ballots - Witnessing of affidavit

A. The voter shall be required to mark the ballot in ink or
other manner as prescribed by the Secretary of the State Election
Board; seal the ballots in the plain opaque envelope; fill out
completely and sign the affidavit, such signature to be notarized at
no charge by a notary public; seal the plain opaque envelope inside
the envelope bearing the affidavit and return both envelopes, sealed
inside the return envelope, by hand delivery, United States mail or
by a private mail service, provided such service has delivery
documentation, to the county election board. No person who is a
candidate for an office on the ballot or who is the chair or
treasurer of the campaign of a candidate for office or who is
related within the third degree of consanguinity or affinity to a
candidate on the ballot may witness any absentee ballot affidavit.
B. The ballot shall not be notarized by any person whose name
appears on the ballot as a candidate or by any campaign chairperson
or campaign treasurer for a candidate whose name appears on the
ballot.
C. Any voter who hand delivers his or her ballot as provided in
subsection A of this section shall provide proof of identity to the
county election board and shall hand deliver the ballot no later
than the end of regular business hours on the day prior to the date
of the election. For purposes of this section, "proof of identity"
shall have the same meaning as used in subsection A of Section 7-114
of this title.