CRC/C/15/Add.196 page 15 (c) six months; That the period for investigation and pre-trial detention can be prolonged for up to (d) of children; That only Tartu and Tallinn have separate rooms and facilities for the questioning (e) That in practice the handling of cases by juvenile committees is very limited and that most cases are processed by the general court system; (f) That the situation at Maardu Prison is difficult and there is not sufficient opportunity for learning or working or participating in social, educational or arts courses. In addition, there are no programmes to protect the youngest and weakest prison inmates from violent behaviour. 51. The Committee recommends that the State party: (a) Ensure that a system of juvenile justice (including the Juvenile Sanctions Act, Means of Influencing Minors Act, the new Penal Code) fully integrates into its legislation and practice the provisions of the Convention, in particular articles 37, 39 and 40, as well as other relevant international standards in this area, such as the Beijing Rules, the Riyadh Guidelines, the United Nations Rules for the Protection of Juveniles Deprived of Their Liberty, the Guidelines for Action on Children in the Criminal Justice System and the Committee’s recommendations at its day of general discussion on the administration of juvenile justice, held in 1995; (b) Ensure that children have access to legal aid and independent and effective complaints mechanisms; (c) children; Train professionals in the area of social recovery and reintegration of (d) Ensure that deprivation of liberty is only used as a measure of last resort, for the shortest possible time, is authorized by the court, and that persons under 18 are not detained with adults; (e) Continue and strengthen efforts to improve conditions at Maardu Prison. Children belonging to minority groups 52. While welcoming the Programme on Integration in Estonian Society, 2000-2007, the Committee notes the tension arising around the question of the language of instruction of children belonging to minority groups in Estonia. 53. The Committee recommends that the State party: (a) Take all measures to implement effectively Regulation No. 209 for mother-tongue instruction for students whose mother tongue is not Estonian;