[EVO X]

They do where I vote. Each paper ballot is linked to the voter who cast it.

Linking a ballot to the voter would be illegal. Annotating that the ballot passed eligibility requirements would seem more likely IMHO.

[ComputerGuy]

Linking a ballot to the voter would be illegal.

No, it's not illegal. It's all about preserving the integrity of the voting process, don't you know. /s