Iso-blocks Etc.
Prisoners are incarcerated in iso-blocks, or isolation blocks, while they serve their sentences. Their cells are called cubes; the sentence is referred to as "encubement."
Readers have in recent stories been introduced to cityblocks made specially for the criminal classes. There are "ASBO Blocks" where instead of going to the cubes citizens are watched over by a sophisticated A.I.. While there they are treated and attempts are made to rid them of criminal tendencies. Although punishments are strictly enforced it is not like prison, as they are permitted to leave the block and go about their lives. When they are found likely to commit serious offenses again they can instead of going to the cubes be fitted with personal ASBO collars with built in A.I.s that watch them all the time.
In the story Psycho Block which appeared in the Judge Dredd Megazine readers were informed that Mega City One has several facilities called Psycho Blocks which house those who are totally immoral and insane. There are no Judges present in these blocks; instead there are privately-run guards and staff. There are rumours of mistreatment which at Psycho Block 12 were verified: Dredd - acting on information supplied by a prisoner - was able to put a stop to unlawful killing and experimentation. It is unknown how other similar Blocks are run.
Read more about this topic: City Block (Judge Dredd)