Effectively no one holds prisons or guards or medical staff in the US to account for these incredibly common and widespread human rights abuses. The parallels with US policing are clear (as is the systemic racism: the system is working exactly as designed).
It even happens to innocent people:
https://en.wikipedia.org/wiki/Kalief_Browder
https://www.latimes.com/local/lanow/la-me-citizens-ice-20180...