CRC/C/15/Add.170 page 20 (c) That young children illegally in the State party are expelled from the country without a process to examine what action would be in their best interests. 73. Noting the State party’s efforts in this regard, the Committee recommends that: (a) Greater efforts be made to study the causes and scope of this concern; (b) Additional efforts be made to provide a response through comprehensive social services to assist children living and/or working on the street, including innovative educational services adapted to the situation of these children and as an alternative to the formal education system, and in cooperation with NGOs; (c) Efforts be strengthened to prevent children from falling into a situation of street life and to assist children in leaving street life, with a particular focus on Roma children. Substance abuse 74. The Committee is concerned: (a) At the smoking of cannabis and the sniffing of petrol and glue by children; (b) That drug abuse rehabilitation services are available only in Athens. 75. Noting the State party’s efforts in this regard, the Committee recommends that the State party: (a) Implement its primary, secondary and tertiary prevention programmes for the prevention and combating of substance abuse throughout the country; (b) Continue to cooperate with NGOs and to work with families in the context of rehabilitation programmes. Sexual exploitation, trafficking and child prostitution 76. Welcoming the State party’s recent bill in this regard, the Committee remains concerned: (a) At reports of the sexual exploitation of children; (b) At reports of children being trafficked into, and sometimes through, the State party for, inter alia, sexual exploitation; (c) At the absence of available official statistics on the sexual exploitation and/or trafficking of children; (d) At the lack of protection under the law of boy prostitutes.