Maybe you would be more interested in the way the justice system upholds societies human rights or how the prison system may take these away. This is a popular topic and would be a great way to go for your dissertation. Take a look at some options below:
he right to withhold labour: The moral maze of prisoner’s rights.
Combining aspects of human rights, welfare reform and public policy, this dissertation reviews proposals put forward by Britain’s Coalition government to make prisoners work whilst they are in custody. Though the notion of making prisoners work for their food and shelter may be popular (especially amongst certain sectors of the British press) this dissertation questions whether it is morally acceptable to make prisoners work. This is a dissertation that would benefit from a range of interviews being undertaken with organisations such as the Howard League for Penal Reform as well as with probation officers, judges and convicts themselves.
Suggested initial topic reading: