STATISTICS OF PROCEEDINGS Figure 13. Distribution of cases by location of petitioner 6. Language of proceedings Most petitions are still in Estonian. 1565 cases, i.e. 78.1% of the total number of cases, were opened based on petitions in Estonian. 333 cases, i.e. 16.6% of the total number of cases, were opened based on petitions in Russian, which is slightly less than in 2009. The number of petitions in other languages was still very small, making up only 0.2% of the total number of cases opened. Figure 14. Distribution of cases by language of petition 7. Inspection visits The Chancellor of Justice is authorised to conduct inspection visits to institutions subject to his supervision. On this basis, the Chancellor may, for example, carry out inspection visits to prisons, military units, police detention centres, expulsion centres, reception or registration centres for asylum seekers, psychiatric hospitals, special care homes, schools for pupils with special educational needs, general care homes, children’s homes and youth homes. Inspection visits are divided into regular and extraordinary visits. Regular inspection visits are scheduled in the annual action plan of the Office of the Chancellor of Justice, and supervised institutions are notified about them in advance. Extraordinary inspection visits are not reflected in the annual plan. Supervised institutions are not notified about them in advance, or they are notified immediately prior to inspection. As of 18 February 2007, the Chancellor of Justice also functions as the national preventive mechanism established under Art 3 of the Optional Protocol to the UN Convention for the Elimination of Torture and other Cruel or Degrading Treatment or Punishment (OPCAT), so that targets of inspection visits include, in addition to national custodial institutions, all other institutions where freedom of individuals may be restricted. Inspection visits are divided into three categories, depending on the agency or institution inspected: • inspection of closed institutions – institutions where individuals are staying involuntarily and where their freedom may be restricted (OPCAT institutions); 89