1 Ballot papers are invalid if they
are not official;
have been completed other than by hand;
do not permit the intention of the voter to be clearly recognised;
contain defamatory remarks or obviously irrelevant markings;
…
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 schemes2, 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.3
1 Repealed by No II of the Federal Act of 22 March 1991, with effect from 1 Jul. 1992 (AS 1991 2388; BBl 1990 III 445). 2 Term in accordance with No II 4 of the Federal Act of 20 March 2008 on the Formal Revision of Federal Legislation, with effect from 1 Aug. 2008 (AS 2008 3437; BBl 2007 6121). This amendment has been made throughout the text. 3 Inserted by No I of the Federal Act of 21 June 2002, in force since 1 Jan. 2003 (AS 2002 3193; BBl 2001 6401).