Unless you compare that to the number of people who became rehabilitated, that is just anecdotal evidence, though. I've heard it a lot, too. But "a lot" means

Unless you compare that to the number of people who became rehabilitated, that is just anecdotal evidence, though. I've heard it a lot, too. But "a lot" means still less than 100 times. There are millions of prisoners. Not saying it isn't the case, just saying I'd like to have more data.