Annual Report 2014 of the National Preventive Mechanism Interior of a cell at the Police Station of the CNP of Almeria 97. It should be ensured that the cells are adequately cleaned and ventilated. It must likewise be ensured that their lighting permits due rest of the persons deprived of liberty, and that it is adequate so as not to be an unnecessarily afflictive measure for the detainees. Lastly, excessive oscillations of temperature at the cells should be avoided, by adapting it to the weather and station of the year. III. 2 Criteria to be met at facilities for mean-term deprivation of liberty III.2.1 Centres for internment of foreign nationals 98. As in the above section, it is considered that facilities for mean-term deprivation of liberty, specifically CIE, should also meet criteria as regards the treatment afforded to detainees, and certain elementary material requirements. 99. The control of the state of health of the inmates of a CIE is a fundamental duty towards each one of them since their physical and mental health may be affected by previous traumatic experiences. The special circumstances of the inmates at such centres, with poor expectations as regards their personal situation, the uprooting of persons who led an adapted life, their little relationship with their loved ones, the lack of alternatives and the type of life they lead at the centre, render it advisable that they may be afforded psychological assistance. 58