As part of the scheme, all children seen in the city centre during school hours are stopped and questioned by police officers and education social workers - even if they are accompanied by an adult.
The number of recorded crimes committed by school age children during school time fell by a third in one year, from 417 cases in the academic year 1997/98 to 279 in 1998/99.
As part of the scheme, all children seen in the city centre during school hours are stopped and questioned by police officers and education social workers - even if they are accompanied by an adult.
Those without a valid excuse for absence are returned to school.
The drive against absenteeism in York also involves former truants going into schools and explaining why playing truant did not pay off for them in the long term.
Asked if the drop in youth crime in school time could be down to more crimes going unnoticed, Carole Patrick, development manager for the Safer York Partnership, said: "You could always argue that, but it's a question of reported crime. This is the best guide we've got that our work is effective."
'Entroubled' children
The truancy watch also enabled the authorities to help children whose truancy stemmed from a deeper problem, said assistant director of Education for York City Council, Murray Rose.
"Their truanting could be down to problems at school, with parents, siblings, domestic problems, bullying.
"This approach allows us to ask them why they're out of school, what the problem is and provides a platform to talk about it," he said.
Mr Murray spoke of how the scheme had identified a 13-year-old truant who was being manipulated by an older man to shoplift on his behalf.
"It's not just about keeping retailers happy, it's about basic health and safety and child protection as well."