I'd rather not have technically proficient felons near passwords, credit card #s, and other personal information.
Edit:
I hate to sound like a Calvinist here, but you have to ask yourself how much a change in behavior is due to "rehabilitation", and how much of it is purely situational.
From what I've seen, they're model employees, until the setback--be it divorce, drugs, financial hardship, stress, etc. Then there is the backslide.
And you don't have to take my word for it. Recidivism rates are very very high.