MONITORING PLACES OF DETENTION : A PRACTICAL GUIDE 53 It is recommended that the national preventive mechanism be permitted: Visits at any time, without prior notification to the detaining authorities. In any case, in all circumstances, access should be given as quickly as possible. 3.3 Follow-up of visits under the Optional Protocol 3.3.1 Reporting and recommendations National preventive mechanisms shall produce an annual report that States Parties to the OPCAT are obliged to publish. The content of the annual report is for each national preventive mechanism to determine, but nothing prevents the inclusion of most information contained in visit reports. In any case, the annual report should mention the recommendations made to the authorities. The States Parties are not obliged to, but can give their consent to the publication of all visit reports by a national preventive mechanism. The national preventive mechanism can also forward the report to the relevant UN Sub-Committee, if necessary, confidentially. National preventive mechanisms must treat confidential information as privileged and can not publish any personal data without the express consent of the person concerned. 3.3.2 Complementary preventive action National preventive mechanisms can also complement their visits and recommendations with other actions aimed at preventing illtreatment and at improving conditions of persons deprived of their liberty such as: - Organising training seminars for relevant personnel concerned with or in charge of persons deprived of their liberty;