Mínimum criteria in deprivation of liberty Kitchen of Ilundáin at Valle de Aranguren (Navarre) 281. “Witness” samples should be kept of the meals supplied for the legally established time, for them to be tested in an eventual intoxication. 282. It is of particular importance for the facilities to be adequate for the inmate population, well kept and maintained and ensuring the safety of the admitted minors. 283. All centres should have a centralised mechanical opening system for the doors to the rooms, to ensure emergency evacuation if necessary, and have interphones or lighting or sound calling systems within them, for minors to be able to communicate with the educators in a situation requiring their immediate assistance. Call control board at Ilundáin, Aranguren (Navarre) 284. Likewise, the fire-safety measures should be improved, its being desirable for all establishments to have smoke detectors (even inside the rooms), alarm push bells, extinguishers, evacuation doors and an evacuation plan. 285. To the extent possible, it would be advisable to consider the location of the centres since a good natural environment benefits the participation of minors, having positive effects on the professionals working at them. 97