In 2010, the National Preventive Mechanism carried out 80 preventive visits (that is almost one-fifth less than in 2009) to 79 units24.The most frequently visited places of detention included: rooms for detained persons within the police organisational units (15 units, 4.4% of all rooms for detained persons within the police organisational units) and sobering stations (13, 30% of all stations). In addition, around 11.8% of all places of detention for juveniles were visited (most visits were to youth care centres – 6.2%), as well as 8.9% of penitentiary establishments (pre-trial detention centres - 5.7%, prisons - 3.2%). In 2010, NPM also carried out visits to 5 psychiatric hospitals, 6 social care centres, 3 detention places for foreigners (2 deportation centres and 1 guarded centre for foreigners). The chapters below present the results of visits to individual places of detention visited by the National Preventive Mechanism in Poland in 2010. Unlike previous annual reports of the National Preventive Mechanism, each chapter contains the most important standards and regulations included in international and domestic legal documents, based on which the NPM representatives carried out visits and formulated recommendations. 7.1. Rooms for detained persons within the police headquarters In 2010, employees of the National Preventive Mechanism visited 15 rooms within the Police organisational units (hereinafter referred to as Chambers)25, where detained persons or persons brought to sober up may be held. Figure 3. Number of visits of the National Preventive Mechanism in rooms for detained persons within the police organizational units in the years 2008-2010. 2010 r. ; 15 2008 r.; 11 2009 r. ; 21   At the beginning of the chapter on preventive visits carried out in 2010 by the National Preventive Mechanism in rooms for detained persons within the Police                                                              24 A sobering station in Gdańsk was visited twice in 2010. Rooms for detained persons within Municipal Police Headquarters in: Bytom, Wrocław, Koszalin, Gdynia, Legnica, Gliwice, Chełm, Jaworzno, Kielce; rooms for detained persons within Poviat Police Headquarters in: Legionowo, Nowy Dwór Mazowiecki, Kutno, Środa Wielkopolska, Mogilno; rooms for detained persons within the District Police Headquarters Warsaw I. 25