Tens of thousands of Iranians are being held in "black box" detention sites with no judicial oversight, official records, and no way for families to confirm whether their loved ones are alive, according to reports.
The facilities — which the removed from the formal prison system, they effectively disappear into these sites.
There is no paper trail and no legal supervision, leaving individuals highly vulnerable to abuse.
CHRI said the risk of torture, coerced confessions, sexual abuse and deaths in custody inside these facilities is extreme.
Outside the facilities, families are often left traumatized after having to spend days outside courts and prisons that deny holding their children, the report said.
"The precise locations of these black box sites are unknown, which is part of their function," Safavi said.
"This ensures total isolation and no access or contact. Agents inside are able to employ whatever methods they choose, much like at Ghezel Hesar Prison in the 1980s," he explained.
"The clandestine sites eliminate witnesses and prevent documentation that could lead to leaks," Safavi said.
The findings come amid reports of escalating executions in Iran following recent protests, during which thousands of people were killed at the hands of the clerical regime.
The nationwide protests.