More than half of youths involved in child prostitution in Japan's three biggest metropolitan areas last year had shown no signs of delinquency, attending schools normally and having never had criminal records, a survey showed Tuesday.The finding suggests it has been increasingly difficult for parents and teachers to detect a change in the attitude of juveniles, the National Police Agency said, while warning that many of them were victimized by people they got acquainted with through social networking sites and using smartphones.The survey covered 193 girls and a boy in cases handled by pol…READ FULL ARTICLE