The MD state system covers that issue. When I arrive to vote in person they will see the serial number of the mail ballot that was supposed to have been sent to me. By voting in person, I will be canceling that mail-in ballot. The system accidentally sent TWO mail-in ballots to over 700 folks, but since both of those ballots have the same serial number, voting one will cause the system to cancel the other. Because of this glitch, local newspapers carried a whole story about the mail ballot system in MD.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.