Election Obligations & Standards Database
"The names and number of requesting voters who have used or are using the special provisions should be recorded in polling-station and other protocols in order to avoid double voting…"
International IDEA: International Electoral Standards: Guidelines for Reviewing the Legal Framework of Elections
, p. 74
International Electoral Standards: Guidelines for Reviewing the Legal Framework of Elections
Provided they allowed for consistency with other international obligations, safeguards may be used to diminish the potential for duplicate voting.