Such reasons can be defined very narrowly, to include election officials and military personnel absent due to official business, or more broadly to include all those for whom voting on the normal election day is simply inconvenient. 10 Exemptions from Voting While election authorities often are dedicated to ensuring that all those who are eligible to vote are registered to do so, in systems where voting is mandatory a somewhat paradoxical issue may arise. Some eligible registered voters may actually wish to be excused from voting. In Brazil, for example, voting is mandatory for everyone aged eighteen to seventy years. The only exception occurs if one is illiterate, in which case voting is optional.
Voting is also optional between the ages of sixteen and seventeen and after seventy years.
Moldova The system used in Moldova provides for particularly liberal registration procedures. Voters who have moved recently and haven't yet completed change of registration forms can be placed on a supplementary roll or have their passports stamped for a ballot at the polling booth. Although these procedures could lend themselves to electoral fraud, strong criminal sanctions against multiple voting have all but eliminated this risk in Moldova.