The programming code in electronic voting machines is not currently publicly available, leading to concerns with election rigging, as exemplified by the sworn testimony found here: https://www.youtube.com/watch?v=1thcO_olHas&feature=youtube_gdata_player
Making all the programming code public knowledge, or "open-source," ensures close scrutiny of all code by citizens, exposing any bias or rigging inherent within a formerly closed system. The source code for tallying valid votes should only be considered valid when confirmed independently by those without a conflict of interest. Opening the source code to the public is the best way to ensure fairness in all voting processes.
Therefore, all code shall be open-source and available to the public for analysis.