Election Obligations & Standards Database

Quote

"The tear-off part of the ballot should not bear any serial number, while the counterfoil might have these numbers for control purposes."

Document

International IDEA: International Electoral Standards: Guidelines for Reviewing the Legal Framework of Elections, p. 72

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International Electoral Standards: Guidelines for Reviewing the Legal Framework of Elections

Summaries

Provided they allowed for consistency with other international obligations, safeguards may be used to diminish the potential for duplicate voting.
The system for balloting (paper, electronic, or otherwise) should ensure the secrecy of a voter's choice.