counted for the individual candidates. The number of ballots was thus much larger than the number of votes in each contest. The software was fixed, and the ballots were re-scanned to get correct counts. In the 2000 Florida presidential race the most common optical scanning error was to treat as an overvote a ballot where the voter marked a candidate and wrote in the same candidate. Researchers find security flaws in all election computers, which let voters, staff members or outsiders disrupt or change results, often without detection. Security reviews and audits are discussed in Electronic voting in the United States#Security reviews. When a ballot marking device prints a bar code or QR code along with candidate names, the candidates are represented in the bar code or QR code as numbers, and the scanner counts those codes, not the names. If a bug or hack makes the numbering system in the ballot marking device not aligned with the numbering system in the scanner, votes will be tallied for the wrong candidates. This numbering mismatch has appeared with direct recording electronic machines (below). Some US states check a small number of places by hand-counting or use of machines independent of the original election machines. Recreated ballots Recreated ballots are paper or electronic ballots created by election staff when originals cannot be counted for some reason. They usually apply to optical scan elections, not hand-counting. Reasons include tears, water damage and folds which prevent feeding through scanners. Reasons also include voters selecting candidates by circling them or other marks, when machines are only programmed to tally specific marks in front of the candidate's name. As many as 8% of ballots in an election may be recreated. Recreating ballots is sometimes called reconstructing ballots, ballot replication, ballot remaking or ballot transcription. The term "duplicate ballot" sometimes refers to these recreated ballots, and sometimes to extra ballots erroneously given to or received from a voter. Recreating can be done manually, or by scanners with manual review. Because of its potential for fraud, recreation of ballots is usually done by teams of two people working together or closely observed by bipartisan teams. The security of a team process can be undermined by having one person read to the other, so only one looks at the original votes and one looks at the recreated votes, or by having the team members appointed by a single official.