A Brief Primer on Electronic Voting
Equipment
Electronic voting systems come in three distinct
flavors. Here is a very brief overview of each.
Direct Recording Electronic (DRE) equipment
A DRE machine is a computer with a screen for
displaying ballots and a keyboard or touchscreen
through which the voter marks the ballot. The ballot
can be displayed on a single screen (if the screen is
large enough), in which case it is called a
full-face ballot, or on a sequence of
screens. A DRE machine can be made accessible to
voters with various disabilities through the addition
of alternative mechanisms for displaying and marking
the ballot. These include audio response units for
use by the blind and puff tubes for those with
impaired motor skills.
In a DRE machine, the voter verifies the image
that is displayed on the screen. After the ballot is
cast, an electronic form of the ballot is stored
inside the machine. While inside the machine, it is
under the complete control of the software running on
the voting machine. There is no way to verify that
the electronic form of the ballot agrees with the
screen(s) that captured the voter's intent. If the
electronic record is later damaged or lost for any
reason, there is no way to recover the voter's intent
or to perform a meaningful recount.
DRE with Voter-Verified Paper Ballot Printer
(DRE+VVPB)
A DRE+VVPB machine adds a ballot printer to a
basic DRE machine. After the voter marks the ballot,
the ballot is printed out behind a glass panel and
the voter is given the opportunity to verify its
correctness. If the voter accepts it as correct, the
voter's selections are stored internally, just as
with an ordinary DRE machine, but in addition, the
voter-verified paper ballot is automatically placed
in a locked ballot box. After the polls close, paper
ballots from a random sampling of voting machines can
be hand-counted as a check on their correct
operation. The paper ballots also serve as a backup
in case the electronic versions of the ballots become
damaged or lost, and they become the official record
of voter intent in case a recount is required.
Precinct Optical Scan Systems
In a precinct optical scan system, the voter marks
a paper ballot, either with a pen or with the
assistance of a computerized ballot marking
device. The voter then inserts the marked ballot
into a scanner, which reads the ballot and displays
it to the voter for verification. It also warns the
voter of overvotes and undervotes for any office. If
any problems are detected, the voter has the option
of requesting a new ballot and starting over. After
the polls close, the ballots are optically counted,
either at the precinct level or centrally. In case of
a recount, the ballots can be rescanned by the same
or different scanner, or they can be counted by
hand.
A ballot marking device allows voters
with various disabilities to mark the paper optical
scan ballots without assistance. It is similar to a
disabled-accessible DRE machine except that the
voter's selections are not recorded
internally but are instead printed on a ballot form
suitable for optical scan. After the ballot is
marked, the voter inserts it into a scanner for
verification, just as one does with a hand-marked
ballot. In either case, the ballot is checked for
readability and other problems and the voter is given
the opportunity to request a new ballot. Like the
ballot marking device itself, the scanner is made
accessible to the disabled by being equipped with an
audio response unit and other accessibility
mechanisms.
A Brief Comparison of Voting System
- Accessibility and HAVA Compliance
- All three systems meet the Help America Vote
Act (HAVA) requirements for private unassisted
voting by the disabled.
- Auditability and Recounts
- DRE+VVPB and optical scan systems both maintain
paper records of the voter's intent. The paper
allows for verification of the voting system and
for recounts when required. DRE machines do not
preserve any voter-verified record of voter intent
and thus provide no means for auditability and
recounts.
- Transparency
- Optical scan systems are more transparent to
voters and poll workers because ballot marking and
vote tabulation are easily-understandable separate
steps performed by different devices.
- Simplicity
- Optical scan systems use the same paper ballots
for ballots cast at a polling place and for
absentee ballots. The two DRE options are unable to
accommodate absentee voting, so paper ballots must
still be printed and counted for use by absentee
voters.
- Cost
- Optical scan systems are likely to be
considerably less expensive than either of the DRE
options. This is because enough DRE machines must
be provided to accommodate every voter,
whereas most voters can mark optical scan ballots
by hand, requiring only a pen and a privacy
booth.
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