On March 24, South Carolina House Bill 3720 was signed into law. It provides for Instant-Runoff Voting in primaries, for overseas absentee voters. Louisiana and Arkansas already have similar laws. Run-off primaries (which exist only in the south) are a problem for overseas absentee voters, since mail service to many overseas locations doesn’t permit ballots for the run-off primary to reach them in time. So, these 3 states have chosen to use Instant-Runoff Voting, so that overseas absentee voters only need to vote once, combining the first primary with the run-off simultaneously.