In Milwaukee, Wisconsin, we have two people cross checking each other to consult 3-ring binders of registered voters for the particular district they are assign

In Milwaukee, Wisconsin, we have two people cross checking each other to consult 3-ring binders of registered voters for the particular district they are assigned to vote in. Your name is check-marked as part of handing you a paper ballot. This may sound laborious and slow but it should be enough to block repeat voting, IMHO.