What if you were scheduled to be out of the state but the trip was cancelled after you sent in the ballot? I suppose that they check your absentee ballot to see if you voted in person. but if you don't?
This depends on states, but every state has some method to control this to ensure that people do not double vote. For example, in my district, our roll books (that voters sign in on) tell us if they were issued an absentee ballot. If a voter shows up to vote and the roll book says they got an absentee ballot, we tell them they need to surrender the absentee ballot, first. If the voter says "I threw it away, I lost it" etc, then they have to vote a "provisional ballot", which means that the ballot is collected separately. Back at Voter Central, the workers there look at each provisional ballot and match it against a master list, carefully checking to make sure there's one vote per voter, no more.
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