Federal Act on Political Rights

¹Bal­lot pa­pers are deemed in­val­id if they

a.

con­tain the names of more than one per­son;

b.

are not of­fi­cial;

c.

have been com­pleted oth­er than by hand;

d.

con­tain de­fam­at­ory re­marks or ob­vi­ously ir­rel­ev­ant mark­ings;

e.¹

…

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

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