summer months, keeping under the focus of attention the drinking water supply of prisioners. Considering the recommendations relevant preventive measures have been undertaken in this direction, the measures on improving the detention conditions have been included into the plan of actions, as well as the temporary difficulties have been eliminated by corresponding service areas. The information on supposed subjection to ill-treatment or violence and received on this regard were investigated on the spot, the doctor –member of the NPG also participated in these visits, the Office of the Prosecutor General was urged immediately upon the gathered materials and it was recommended the efficient investigation taking the raised matter under the control. The proposals and recommendations put forward by the NPG members within the frames of the activity of the Commissioner as the NPM in compliance with the OPCAT and the Constitutional Law, are linked to the national legislation and based on the reports of the CAT, SPT, CPT, European Penitentiary Rules, Istanbul Protocol and other international standards. In 2016, the National Preventive Group members of the Ombudsman (NPG) conducted several scheduled and ad-hoc visits without prior notification to Baku Investigation Isolator. The purpose of these visits was to investigate the detention conditions and treatment, as well as the appeals addressed to the Commissioner, the situation with ensuring the accused persons’ rights, conduction of relevant documentation. Within the frames of the visit conducted with the participation of doctor – member of the NPG, the arrested persons from different object of the institution were received, the works carried out on treatment matters, detention conditions with regard the switch to a summer regime, ventilation, nutrition, water supply, medical aid, as well as the status of implementation of recommendations put forward during the previous visits were investigation on the spot. Within the frames of the visits the persons urged to the Commissioner, including several other persons upon their request were received tête-à-tête, their applications were heard and investigated on the spot. For investigation of appeals, the documents confirming the legality of detention of the arrested persons, medical books were inspected. During investigation of appeals on treatment matters, the notes in relevant journals on passing the preliminary medical examination of those persons when being brought to the investigation isolator and after this examination, the compiled acts, the matters of creating environment for meeting with relatives and lawyers, as well as phone connections were the subject of the 33