Paragraph 45 Challenge of voter
If at the time a person applies for a ballot paper at a Scottish parliamentary election for the purpose of voting in person, or after he has applied for a ballot paper for that purpose and before he has left the polling station, a candidate or the election or polling agent of a candidate or of a registered party standing nominated–
declares to the presiding officer that he has reasonable cause to believe that the applicant has committed an offence of personation; and
undertakes to substantiate the charge in a court of law,
the presiding officer may order a constable to arrest the applicant, and the order of the presiding officer shall be sufficient authority for the constable so to do.
A person against whom a declaration is made under this paragraph shall not by reason of it be prevented from voting.
A person arrested under the provisions of this paragraph shall be dealt with as a person taken into custody by a constable for an offence without a warrant.