The Federal Agency recommends to fit all detention cells with suitable washable, inflammable mattresses. The Federal Police gave an on-the-spot assurance that appropriate mattresses would be procured. The Federal Police said that the detention cells were designed only for brief stays. Mattresses were therefore only provided when actually needed. The units of the Federal Police had however all been supplied with appropriate mattresses after an examination had been carried out by the Federal Police Headquarters. 5. Federal Police Stations in Düsseldorf Airport and Düsseldorf in January 2011 The Federal Agency carried out inspection visits to the Federal Police Stations in Düsseldorf Airport and in Düsseldorf on 19 and 20 January 2011. The inspection of Düsseldorf Airport was limited to the return area. Here, the Federal Agency held private talks with all persons to be returned and also attended a briefing session. Additionally, the Federal Agency inspected a medical examination room in Module F. The inspection of Federal Düsseldorf (Main Station) Police Station included the entire detention area, as well as the questioning and search rooms. Furthermore, questions regarding the respective workplace were discussed with some staff members. The Federal Agency inspected detention documents and had itself handed out an overview of the complaint events in 2010. Recommendations of the Federal Agency Metal fixation devices were on the mats. The Federal Agency stresses that it did not find any such fixation devices on previous inspections of units of the Federal Police. The provision contained in 618.3 of the Regulations, Guidelines, Instructions, Collections of Lists and Reference Works (Bestimmungen, Richtlinien, Anweisungen, Sammlungen von Katalogen und Nachschlagewerken – BRAS) also does not contain any such requirement. Fixation should be restricted to the shortest possible time, respecting the strictest proportionality. Here, the fixated person must be monitored constantly and directly by a staff member. Furthermore, persons should not be fixated with police handcuffs since handcuffs constitute a considerable risk of injury, particularly with persons who are exited. One of the detention cells in the Federal Police Station in Düsseldorf is fitted with an in-ground toilet which can be completely viewed by a wide-angel spy-hole (for a legal evaluation cf. 30 Reaction of the Federal Ministry of the Interior It was said that the Federal Police Headquarters had ordered the removal of all remaining fixation facilities in detention cells on 25 March 2011. The Federal Ministry of the Interior is said to have already stated its position on the use of wide-angel spy-holes in detention doors on another occasion (cf. C.I.3).