Quote

"...States should: Establish an effective, impartial and non-discriminatory procedure for the registration of voters; Establish clear criteria for the registration of voters, such as age, citizenship and residence, and ensure that such provisions are applies without distinction of any kind."

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IPU: Declaration on Criteria for Free and Fair Elections, para. 4(1)

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Declaration on Criteria for Free and Fair Elections

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Summaries

Limits on the right to vote may be based on a minimum age.
Limits on the right to vote may be based on citizenship.
Limits on the right to vote may be based on residency.
States must take steps to establish an effective procedure for voter registration.