Election Obligations & Standards Database
"Issues and procedures to observe include: is there any sign of partisan campaign materials or campaign activity in the polling station?"
OSCE (ODIHR): Election Observation Handbook (Fifth Edition)
, p. 55
Election Observation Handbook (Fifth Edition)
Voters are free to vote for any candidate for election, for or against any referendum or proposal, for or against the government, without undue influence or coercion of any kind which may distort or inhibit free expression.