Commonwealth Electoral Act 1918

The Electoral Commissioner may also provide for a ballot paper to be marked with any other mark that the Electoral Commissioner thinks fit to assist in the administration of the election.

A mark under subsection (1) does not need to be printed in black typeface.

To avoid doubt, this section does not authorise a mark to be made that enables the identification of an elector or that identifies the personal information (within the meaning of the Privacy Act 1988) of an elector.

An officer who marks a ballot paper enabling an elector to be identified may commit an offence under section 271.