This is where I explain where my question for the week came from. But today I've got nothing. It's one of those that I put together through sheer will (and the knowledge that I needed a question for today). It's been done in various forms, so let's look at it from a slightly different angle.
What if there was a reliable way to wipe someone's memory? What if the penal system got a hold of this technology? How might they use it? Would this be more of a punishment or more of a rehabilitation technique?