1. a ballot other than the official ballot was used for casting the vote, or
2. the ballot was impaired by a piece of it torn off in such a way that it is no longer clear which party the voter intended to vote for, or
3. no party and no person campaigning was indicated, or
4. two or more parties were indicated, or
5. a list was indicated that only contains a list number but no party name
(§ 49 al. 5), or
6. only a campaigner was named, who is not campaigning for the party listed in the same column, or
7. it is not clear from the signs made or other indications which party he intended to vote for.
(2) Empty voting envelopes shall count as invalid ballots. If a voting envelope contains several ballots bearing the names of different parties, they shall count as an invalid ballot, if they are not already invalid due to other reasons.
(3) Words, remarks, or signs that are noted on the official ballots other than for the indication of the campaigning party or for the naming of a person campaigning, shall not impair the validity of the ballot, if thereby none of the abovementioned grounds for invalidity is given. Attachments of all kind found in the voting envelope shall not impair the validity of the official ballots.
