Invalid ballot papers 

1 Ballot papers are invalid if they:

1. are not official;


2. have been completed other than by hand;


3. do not permit the intention of the voter to be clearly recognised;


4. contain defamatory remarks or obviously irrelevant markings;


5. ...

2 Grounds for invalidity or nullity that relate to cantonal procedures (official voting envelope, validation stamp, etc.) are reserved.

3 In the case of electronic voting pilot schemes, the legislation of each canton conducting such a scheme shall determine the requirements according to which votes are validly cast and the grounds for invalidity.