Not allowing prisoners to vote is being labelled a dangerous precedent, with claims it could be extended to other groups considered unfavourable.
Prisoner Arthur Taylor is representing himself in the High Court at Auckland today, arguing Prime Minister John Key shouldn't have been elected in Helensville, as Auckland Prison inmates were denied their right to vote.
Taylor says a 2010 amendment to the law which stopped them voting is dangerous, as parliamentarians shouldn't decide who can and can't elect them.
He said there was no telling who the amendment could be extended to, alleging refugees, beneficiaries, or those who earn less than $28,000 could all be on the list.
Taylor also said a high proportion of the prison population were Maori, so the issue was not just about human rights, but also respecting the Treaty of Waitangi.