Federal Act on Political Rights

¹Bal­lot pa­pers are in­val­id if they

a.

are not of­fi­cial;

b.

have been com­pleted oth­er than by hand;

c.

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

d.

con­tain de­fam­at­ory re­marks or ob­vi­ously ir­rel­ev­ant mark­ings;

e.¹

…

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

³In 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