They should be about rehabilitation. That said, I think at least part of it is related to risk to the outside population. i.e. Inmates performing illegal acti

They should be about rehabilitation. That said, I think at least part of it is related to risk to the outside population. i.e. Inmates performing illegal activity or otherwise directing people on the outside to do so. Yes, You can do that with phones and visits as well, however those are a bit easier to monitor.