MONITORING PLACES OF DETENTION : A PRACTICAL GUIDE 144 LIGHTING AND VENTILATION Standards 3 “In all places where prisoners are required to live or work, (a) The windows shall be large enough to enable the prisoners to read or work by natural light, and shall be so constructed that they can allow the entrance of fresh air whether or not there is artificial ventilation; (b) Artificial light shall be provided sufficient for the prisoners to read or work without injury to eyesight.” SMR, Rule 11 (see also EPR Rule 16) “1. The medical officer shall regularly inspect and advise the director upon: (c) The sanitation, heating, lighting and ventilation of the institution.” SMR, Rule 26 “The CPT frequently encounters devices, such as metal shutters, slats, or plates fitted to cell windows, which deprive prisoners of access to natural light and prevent fresh air from entering the accommodation. They are a particularly common feature of establishments holding pretrial prisoners. The CPT fully accepts that specific security measures designed to prevent the risk of collusion and/or criminal activities may well be required in respect of certain prisoners. However, the imposition of measures of this kind should be the exception rather than the rule. This implies that the relevant authorities must examine the case of each prisoner in order to ascertain whether specific security measures are really justified in his/her case. Further, even when such measures are required, they should never involve depriving the prisoners concerned of natural light and fresh air. The latter are basic elements of life which every prisoner is entitled to enjoy; moreover, the absence of these elements generates conditions favourable to the spread of diseases and in particular tuberculosis.