# The Scottish Local Government Elections Order 2011, Paragraph 16: Security marking


(1) Every ballot paper must bear or contain—
(a) a unique identifying mark; and
(b) an official mark.
(2) The official mark shall be kept secret, and an interval of not less than five years shall intervene between the use of the same official mark at elections for the same local authority.

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Source: https://www.legislation.gov.uk/sdsi/2011/9780111014639/schedule/1/paragraph/16 (the official version)
Page: https://openlegislation.uk/draft-scottish-local-government-elections-order-2011/schedule-1/paragraph-16
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.