court ruled it could.
the ones that match are quickly recognized, the ones that immediately do not, get moved to the auditors who check closer, and approve or disapprove, if disapproved it immediately gets sent to third set of signature auditors, who approve of disapprove...who then have people notify the voter that their signature did not match the file and for their vote to count, they have to come in to their election office, with ID and CURE their signature.
AND before a Ballot is mailed to a voter, the voter had to request a ballot individually and where to send it, and the voter has to be a legal, registered voter....many states have tracking, where the voter can follow the ballot being mailed to them, and track the ballot mailed by them, to see if the election office received it!