Once you have paid your debt to society you are done paying your debt to society. Banning the box as well as other inquiries into individuals past histories should be prohibited the moment that debt has been paid.

If you think people need additional punishment then you need to lock them up until you think they have been punished fully. This lingering on of punishment seems to be society's fetish of getting off on the suffering of others.

@2- I am not saying that employers should be able to categorically exclude everyone with any kind of criminal conviction, but do you honestly believe that looking into whether an applicant for an accountant position has a conviction for embezzling is out of place? Or that it is not relevant whether an applicant for a job that involves going into customers' homes has a couple of prior burglary convictions?

Your thesis that someone's past is irrelevant once he/she has "paid their debt to society" goes a little far. If you are right, a past conviction would have no predictive value as to the chance someone will commit crimes in the future. This is simply untrue, as our large recidivism problem shows.