Where’s the proof Kelvin?

The Herald reports:

Minister of Corrections Kelvin Davis has spoken in favour of prisoners having the right to vote, saying it is an important part of reducing reoffending.

Interesting that Labour is campaigning to give Clayton Weatherston the vote.

If there was evidence that allowing prisoners to vote reduces reoffending, I’d be interested to see it.

Is there any such evidence?

What happened to the reoffending rate of prisoners sentenced to less than three years jail after they lost the vote around 2011? Does Kelvin have data showing that their reoffending rate has increased since then.