Secretary-General’s October 2016 report on human rights in Iran
The present report is submitted in accordance with General Assembly resolution 70/173, in which the Assembly requested the Secretary-General to report to it at its seventy-first session on the progress made in the implementation of the resolution. The report reflects patterns and trends in the human rights situation in the Islamic Republic of Iran and includes recommendations to improve the implementation of resolution 70/173.
Page 6 of the report says:
23 .Special procedures mandate holders continued to receive reports of widespread use of solitary confinement. According to those reports, the authorities reportedly routinely subject detainees and prisoners to solitary confinement for a period that could range from a week to years and, in some instances, for an indefinite period.
For instance, Mohammad Ali Taheri, who is the founder of a spiritual movement, a writer and a practitioner of alternative medical treatments used in the Islamic Republic of Iran and abroad, has been held in solitary confinement since his arrest in May 2011. He was sentenced to five years in prison for insulting the sanctity of Islam. Although he has served his sentence, he has not been released.