The Center for Voting Technology Research (VoTeR Center) at the School of Engineering of the University of Connecticut performed pre-election and post-election audit of the memory cards for the Accu-Vote Optical Scan (AV-OS) tabulators that were used in the April 24, 2012 elections. The cards were programmed by LHS Associates of Salem, New Hampshire, and shipped to Connecticut districts.
Cards were submitted for two reasons per instructions from the SOTS Office (a) one of the four cards per district was to be selected randomly and submitted directly for the purpose of the audit, and (b) any card was to be submitted if it appeared to be unusable. Given that cards in category (a) were to be randomly selected, while all cards in category (b) were supposed to be submitted, and that the cards were submitted without consistent categorization of the reason, this report considers all unusable cards to fall into category (b).
For the pre-election audit, the Center received 124 memory cards from 110 districts. Among these 124 cards, 81 (65.3%) fall into category (a). All of these 81 cards were correct. There are 43 cards (34.7% of all cards) that were found to be unusable by the AV-OS, thus falling into category (b). In particular, 42 cards contained apparently random (or ‘junk’) data, 1 card was unusable by AV-OS, but did not contain random data (this requires further investigation). All these cards were unreadable by the tabulators and could not have been used in an election. Given that such cards were not selected randomly, we estimate that for pre-election audit the percentage of unusable cards is between 1.6% and 9.8% and this is consistent with prior audits.
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