§ 24A-9.1(untitled)

Whenever an electronic scanning process is utilized to
automatically examine and count the votes on ballot sheets, the provisions
of this Section shall apply. A voter shall cast a proper vote on a ballot
sheet by making a mark in the designated area for the casting of a vote
for any party or candidate or for or against any proposition. For this
purpose, a mark is an intentional darkening of the designated area on the
ballot sheet, and shall not be an "X", a check mark, or any other recognizable
letter of the alphabet, number, or other symbol which can be recognized
as an identifying mark.
 Whenever the ballot sheet includes designated areas on both sides, the
election authority shall provide an envelope, sleeve or other device to
each voter by means of which the voter can deliver the voted ballot sheet
to the ballot box without the votes indicated on the ballot sheet being
visible to other persons in the polling place.
 (Source: P.A. 81-1433.)