I think that prisoners should not be allowed the privelege to acces the internet. They are in prison for a reason, they should have the basic needs. Water, food, and somewhere to sleep, and maybe a job to keep them occupied.
The internet is a luxury and should not be accessed by those in prison. They would abuse it, and use it to make their life in prison more comfortable. Life in prison is not meant to be comfortable, it is meant to be a punishment for the crimes that they have committed. There is no way that the prison service can watch all that the prisoners access on the Internet, sure they can put filters on, but I'm sure that some of the prisoners would be able to get around that, and look at whatever they like.
And to think, we're paying for them to have the luxury of surfing the Internet
Jam it back in, in the dark.