Compulsory voting
Countries that have compulsory voting by law but do not enforce it:Although voting in a country may be compulsory, penalties for failing to vote are not always strictly enforced. In Australia and Brazil, providing a legitimate reason for not voting (such as illness) is accepted. In Argentina, those who were ill on voting day are excused by requesting a doctor to prove their condition; those over away from their voting place are also excused by asking for a certificate at a police station near where they are. Belgian voters can vote in an embassy if they are abroad or can empower another voter to cast the vote in their name; the voter must give a "permission to vote" and carry a copy of the eID card and their own on the actual elections.
Voter registration in the United States
In the United States, such drives are often undertaken by a political campaign, political party, or other outside groups (partisan and non-partisan), that seeks to register persons who are eligible to vote but are not registered. In all states except North Dakota, registration on the electoral roll in the United States is a prerequisite to a person being able to vote at federal, state or local elections, as well as to serve on juries and perform other civil duties. Sometimes these drives are undertaken for partisan purposes, and target specific demographic groups that are likely to vote for one candidate or other; on the other hand, such drives are sometimes undertaken by non-partisan groups and targeted more generally.