As part of on-site verifications, inspectors visit any location required by the investigation to meet with any person and to receive any document under the sole reservations mentioned in Articles 8 and 8-1 of the Act of 30 October 2007 amended. The verifications can be carried out unannounced or at short notice, particularly in order to allow the management to compile the documents requested. The person who referred the case to the CGLPL may also, where applicable, be apprised of this verification and, to the extent possible, interviewed on-site by the inspectors. The latter also take any steps which seem likely to increase their understanding of the case they have been referred, in order to gain as complete a picture of the situation as possible. All on-site verifications lead to a written report setting out the inspectors' findings and recommendations. The report is sent to the authorities concerned, who feed back their observations. At the end of this adversarial procedure, the reports of the on-site verifications and observations are published, unless special circumstances dictate otherwise, on the CGLPL's website. Any information by which the person(s) concerned may be identified is removed beforehand, to respect professional confidentiality and the confidentiality of the talks with the people who referred the case to the CGLPL. 4.1 On-site verifications conducted in 2017 Some on-site verifications concern individual situations, while others are conducted as part of thematic thought processes, which can take place prior to an opinion. Accordingly, one of the on-site verifications conducted in 2017 was to do with work on access to medical care in detention centres for illegal immigrants - following on from the aforementioned referral concerning the Ministers of Health and the Interior. Some on-site verifications, bearing on individual circumstances, can also take place as part of general work. In this way, one on-site verification concerning a hospitalised child was carried out as part of the drafting of the thematic report on the fundamental rights on children in mental health institutions. In all cases, on-site verifications – even when they concern an individual situation – are always an opportunity for the CGLPL to issue general recommendations with a view to preventing fundamental right violations. From January to December 2017, the CGLPL performed seven on-site verifications - three of which were carried out unannounced. Other on-site verifications were announced two to three days prior to the inspectors' arrival. Some of them required observations to be made swiftly on-site with no prior adversarial talks with the responsible authority. In other situations, the information gathered from an adversarial procedure conducted beforehand by post did not enable the CGLPL to gain an objective picture of the situation. Two on-site verifications were carried out at detention centres for illegal immigrants, two in penal institutions and one in a hospital. Two other on-site verifications required travel to more than one institution: for one, a penal institution and a hospital, and for the other, a detention centre for illegal immigrants and the affiliated hospital. 4.1.1 Protection of vulnerable prisoners at the Béziers prison complex For the first time, an on-site verification was conducted jointly with officials delegated by the Defender of Rights. The Chief Inspector had received several referrals in 2016 bearing on the detention conditions at the Béziers prison complex, not least in the solitary confinement wing and punishment wing, as well as reports of violence perpetrated between prisoners and involving warders. 93