Only if it's a minor crime e.g. shoplifting which they have a short sentence for and a none repeat offender.
No! I am absolutely against prisoners voting in this referendum (and in elections for that matter in Scotland and the UK). Why should you be allowed to vote on a State matter when you have committed an offence against that State? I am pro-EU, but I am glad the UK and Scotland have taken a stand against prisoner voting, and I am glad the appeal to vote in this referendum was rejected.
Many U.S states don't even allow felons to vote after they're out. I don't blame them.