clarify the requirements for marking an optical scan ballot.

This bill amends South Dakota election law to require voters using optical scan ballots to mark their choices exclusively with a black ink ballpoint pen. It directly affects all voters in South Dakota who cast ballots through optical scan systems, replacing the previous allowance of pencils or other marking instruments. The key provision specifies that black ink pens are the only permitted tool for marking these ballots, eliminating alternatives like pencils. The change is procedural, focusing solely on ballot marking standards without altering voting procedures or outcomes.