Voting Blogs: Free & Fair to build risk-limiting audit system for State of Colorado | Free & Fair

We are proud to announce that Colorado has chosen Free & Fair to build a risk-limiting audit (RLA) system to be used statewide beginning with the November 2017 general election. First developed in 2008, RLAs promote evidence-based confidence in election outcomes by comparing a random sampling of paper ballots to their corresponding digital versions. This will be the first time anywhere in the United States that risk-limiting audits are conducted on a regular, statewide basis. Free & Fair has already prototyped an open source risk-limiting audit tool called OpenRLA, for RLAs of election contests in single jurisdictions. The production RLA system being developed for Colorado will facilitate statewide, multi-county and individual county audits. Like OpenRLA, the RLA system developed for Colorado will be released under an open source license (GPL Version 3). Risk-limiting audits provide strong statistical evidence that a jurisdiction’s voting system accurately interpreted and tabulated voter markings on paper ballots, with relatively little hand counting. The “risk limit” is the largest chance that an outcome-changing error in the initial tabulation will not be discovered and corrected in the audit. If the risk limit is 5% and the outcome wouldn’t match the result of a full, accurate count of the paper ballots, there is at least a 95% chance that the audit will correct the outcome.

Full Article: Free & Fair to build risk-limiting audit system for State of Colorado – Free & Fair.

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