"Strictly forbidden by law, but rather difficult to prove, is vote buying, i.e. the distribution of goods or money to people combined with the request to vote for a particular candidate or party. This is allegedly common practice in the pre-election period and on election day in some countries, according to international observers. In order to reduce the risk of vote buying on election day, it is important to guarantee the secrecy of the vote. It should also be ensured (and observed) that voters do not leave the polling station without depositing their ballots in the ballot boxes because some voters may try to take blank ballots outside the polling station and give or sell them to other people. As a rule, any unused ballot paper should remain at the polling station. However, in several cases, there were confirmed instances of stamped and signed ballots circulating outside polling stations on election day. "
CoE (Venice Commission): Report on Electoral Law and Electoral Administration in Europe, para. 148

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Report on Electoral Law and Electoral Administration in Europe