Inside a Maryland election centre: How US mail-in votes are secured and counted
BBC Verify has visited an election centre in Maryland for a behind-the-scenes look at how mail-in ballots are processed and counted, as President Trump continues to make unsubstantiated claims linking postal voting to widespread fraud ahead of the US midterm elections on 3 November.
BBC World
Americans go to the polls in the midterm elections on 3 November, and BBC Verify has been given a behind-the-scenes look at how mail-in ballots are processed and counted at an election centre in Maryland.
The visit comes as President Donald Trump continues to make unsubstantiated claims that mail-in voting leads to widespread fraud. The president has said he has used postal voting himself in the past.
Voting rules and regulations differ from state to state across the US, but every state allows some form of postal voting.
The report examines the security measures surrounding the handling of mail ballots, including closed-circuit television cameras, zip ties and the presence of election watchers, as well as the process by which votes are counted.
The full video report, produced by Mabel Pickering with graphics by Sally Nicholls, is available on the BBC News website.