Quote

"The obligation to vote in an embassy or consulate may in practice severely restrict the right to vote of citizens living abroad. This restriction may be justified on the grounds that the other means of voting (postal vote, proxy voting, e-voting) are not always reliable. "

Document

CoE (Venice Commission): Report on Out-Of-Country Voting, para. 97

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Report on Out-Of-Country Voting

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Summaries

Limits on the right to vote may be based on residency.
Residency requirements should not be excessive, or may be considered discriminatory.
Limits placed on the right to vote must be based on objective and reasonable criteria.