He highlighted Gwynedd and Anglesey YOT as reducing offending several years ago by working with police and going into schools to educate children against anti social behaviour.
And he said Swansea YOT had seen a big fall in repeat offenders - decreasing from 204 to 23 between 2001 and 2012 - due to the implementation of a "golden fortnight", when young people who have caused minor offences are assessed and their parents involved to try to change the child's behaviour.