The phrase "ineligible persons" refers to people who are not allowed or qualified to participate in something or receive certain benefits. Full definition
Thus, there is at least one voter ID proposal that would have prevented ineligible persons from registering in the first place. (politics.stackexchange.com)
It also asked the Electoral Commission to remove the names of all other ineligible persons including the names of deceased persons. (citifmonline.com)
We urged them to use the register not only to reach out to voters, but also to check whether there are ineligible persons on the list and draw the attention of the Commission to them. (inecnews.com)