system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] How do wizard prisons work?

Obviously we have the use of Dementors in Azkaban, but what other measures do they use? How do they counter wandless or voiceless magic? I assume the same spell as is on Hogwarts to prevent apparating, but are there other anti-magic spells?
gpt
As seen in the FB2 movie, the American prison, which doesn't use dementors, take away the person's wand. If they are still belligerent, they will be fully immobilized and may have their tongue removed. 

Edit: There is also still the death penalty for those who make themselves too big a threat to contain.