Despite the persons received during the visits made no complaints regarding detention conditions in the institution, treatment and medical aid rendered to them, the overcrowding was observed in the institution, during the visit to cells and other objects it was revealed that the building of the investigation isolator was old and there was need in reconstruction works. The NPG members positively appraised conclusions of repair works in the penal isolator, new quarantine rooms for improving the detention conditions basing on recommendations given during the previous visits and on appeals, as well as the measures on improving the conditions. At the end of the visit, the administration of the investigation isolator was given relevant recommendations on further improving of detention conditions, the medical service and documentation basing on the national and international standards, the Law of the Republic of Azerbaijan on “Ensuring the rights and freedoms of persons kept in detention places” and Internal Disciplinary Rules in Investigation Isolators, legal awareness measures targeted at the service staff were conducted. Within the frames of the activity of the Ombudsman as the NPM the visit was held in Penitentiary Institution No.1. The aim of the visit conducted upon the demands of the OPCAT and the Constitutional Law on the Commissioner for Human Rights (Ombudsman) of the Republic of Azerbaijan was the investigation of the treatment of detainees and their detention conditions, ensuring the prisoners’ rights, as well we the conduction of the documentation. The aim of ad-hoc visits was investigation of appeals addressed to the Ombudsman, as well as received by the Hot-line, also the investigation of detention conditions, treatment mattersand situation with implementation of forwarded recommendations. During the investigation the NPG members visited dormitories, MSU and penal cells of the institution, received the prisoners urged to the Commissioner and with numerous prisoners urging from different objects of the institution. The appeals on and matters of detention conditions and rendered medical aid raised by the persons received during the visit were ensured on the spot. However, several shortcomings were observed during the investigation, such as absence of written board enshrining detainees’ rights and duties in the cells of penal isolator, the need in bettering the condition of sleeping mattress, bringing the number of stools in cells in compliance with the number of detainees. The revealed shortcoming were brought to the attention of the Head of the institution, relevant recommendations were put forward on improvement of documentation and detention conditions, immediate elimination of mentioned insufficiencies at the institutional level. 36