How would you indelibly mark the voter, is it practical?, can we have a central database that can verify if a person has voted instead? In places like Afghanistan I can see this being practical, but I don't think most people would put up with having a mark put on their body....
I don't know either. It was in a reply to an earlier comment I made. Perhaps they are thinking of the Afghanistan election.
I would prefer a biometric voter registration card, that contained an electronic thumb print. If your thumb print doesn't match the one on the card or multiple cards match, there is a problem.
It's just your thumb. It takes several days to wear or wash off, and its only visible under a black light. Lots of countries do it.
The Rat's would claim it was a civil rights violation because black voters would be intimidated by the obvious parallels between inking and the branding of their forefathers.