We do something similar in Spain. We vote with paper ballots. Then, when polls close, the volunteers at each table count the ballots and input the data into an

We do something similar in Spain. We vote with paper ballots. Then, when polls close, the volunteers at each table count the ballots and input the data into an electronic system, which makes the aggregates. In a few hours (4-5) we have the results of the election. However, paper ballots are returned to the voting urns and sealed. The sealed urns are then sent to a few centralized counting locations where they are manually counted again by civil servants during the corse of a few weeks. (Party representatives can witness both countings). Usually there are some very very small differences between the first and the second counting, but I don't recall even a seat changing because of them. This has the advantage of being both fast and safe.