MONITORING PLACES OF DETENTION : A PRACTICAL GUIDE 77 have been any notable changes or events (particularly violent incidents, deaths or other emergencies) since the last visit; ■ ■ ask for the opinion of the person in charge regarding: - the conditions of detention and the persons in their charge, - any problematic aspects of these conditions and their causes, - his or her own proposals for improvements; fix a meeting to talk about the results of the visit. Once the visiting mechanism has carried out several visits to the same place without encountering any serious difficulties or noting any particular problems regarding the conditions of detention, the talk at the start of the visit can be limited to its formal or relational aspects. 4.2 Consultation of registers and other documents In this section, registers are understood only as sources of information about the persons deprived of their liberty and their living conditions. Consulting the registers at the beginning of a visit can be useful, in particular if the visit is to take place over several days. The information obtained from the registers can then, if necessary, be verified during the visit. Depending on the type of place of detention, there can be many different registers. Those most relevant here can be divided into three categories: Registers relating to the persons deprived of their liberty: ■ by category of detainee;