14 THE GREEK OMBUDSMAN Police station cells ρ As a result of information received about the detention of unaccompanied minors, the NPM visited the holding cells of the Omonoia Police Station on 22 June 2016. The premises were in very bad condition and entirely unsuitable for detention, which, moreover, lasted for more than a few days. It is noted that approximately half of the prisoners there on the day of the visit had been detained for more than 15 days and some for up to 1 month. The poor detention conditions and the length of their stay create a stressful environment for both the prisoners and the police personnel. The NPM‘s impression was that detention in the specific premises could be characterised as inhuman and degrading treatment and could cause Greece to be accused before the European Court of Human Rights. ρ On 18 August 2016 the NPM made a no–notice on–site inspection of the Patissia Police Station in order to determine the conditions and procedures of administrative detention of third–country nationals and the treatment of any minors. The detention conditions were found to be quite good and the place was particularly clean. It is noted that the NPM considers it good practice for all police stations that the cell interiors should also be cleaned by the station’s sanitation crew, as opposed to the practice of leaving the cleaning of the cells to the prisoners them-