Thread on #Crosscheck Status in Alabama (revised):

Alabama is one of 8 states the use both #Crosscheck and the widely respected Electronic Registration Information System (ERIC). /2
It is worth reading about ERIC at if you aren't familiar; here is a key part of their Membership Agreement: /3
ERIC member states engage in a continuous process (every 60 days) of removing verified duplicates and outdated registrations /5
in addition to the critical effort of contacting eligible but unregistered voters. (This is not a feature of #Crosscheck). This outreach/5
requirement of ERIC may help blunt the effect of any registrations canceled because of #Crosscheck. /6
Turning to how #Crosscheck is managed in Alabama, I received this yesterday via FOIA: /7
Alabama "accepted only those records where...the last four digits of the social security number were perfect matches." VA, ME, and SC /8
all do similar processing to remove obvious false positives before acting on #crosscheck data. This mitigates the risk of inappropriate /9
purge for those who should have been excluded from the list by #Crosscheck itself due to missing or mismatched SSN4. /10
In 2016, #crosscheck sent Alabama 220,247 pairs of "possible duplicate registrants"; we aren't provided complete enough information to /11
calculate the % of false positives but analysis of other states suggests 60-90% of the file would contain mismatch SSN4 &/or middle name /12
AL found 37,511 pairs w/matching SSN4 AND most recent registration outside of AL which they forwarded to each county for further review /13
and removal. After review, they removed 33,414 of these registrations having verified them as double registered. We are not provided /14
information about voting history for these registrations (i.e., whether most recent vote cast was in AL or the other state). Goel et al /15
argue, in paper titled One Person, One Vote, that the practice of deleting older registrations impedes more valid votes than /16
potential double votes prevented by a factor of 200:1.… /17
We don't know why the remaining 4,097 verified doubly registered voters were not removed. (Will update if that ? is answered). /18
Alabama also clarified that processing of 2017 #Crosscheck records has been suspended due to upcoming federal election. /19
To recap, there is some risk of impeded votes due to Alabama's policy of deleting the AL record if a verified duplicate registrant was /20
more recently registered in a different state. This risk may be mitigated by Alabama's use of ERIC which requires outreach to eligible /21
but unregistered voters. Alabama's reported practice of rejecting #crosscheck records lacking a confirmed match on SSN4 reduces the /22
risk of wrongful urge for voters who are matched w/another voter of the same name and birthday but missing or mismatched SSN4. /23
Despite what appears to be judicious use of #crosscheck, I remain concerned about the decision to delete voter record if AL was the /24
older registration as this risks an impeded vote. /25
I continue to call on Alabama (and all other states) to #LeaveCrosscheck. That Alabama has to remove records with *mismatched* SSN4 /26
drives home two points. First, many of the "pairs" were two voters whose SSN4s have been sent to other states for no reason, & now risk /27
purge. Second, every #crosscheck state must either separately (and wastefully) process the data to remove false positives, or send the /28
entire list to local jurisdictions, exposing voter SSN4 once again and putting voters at risk for wrongful purge. Combined with the /29
recently uncovered security lapses, it is clear #crosscheck is too careless to be entrusted w/100 million voter records from 28 states /30
We call on all member states to #LeaveCrosscheck. We call on Kansas to #EndCrosscheck /end
PS getting voters registered b4 special election is one great way to fight back against #crosscheck. Another is to join me in the fight./x

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More from @LeaveCrosscheck

Oct 21, 2017
Thread about Kansas "Strength of Match" Criteria for Crosscheck /1
Kansas pays for and administers #Crosscheck, a voter registration list maintenance tool, on behalf of all 28 member states. Member states/2
send voter registration records to KS every year; KS sends them back file of "possible duplicate registrants" for processing. /3
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