In Papakura, in Auckland's south, crime and gangs are a regular feature of many students' lives and can affect their education.
However as Inspector Dave Glossop explains in the above video - part of the Herald documentary Under The Bridge - the town isn't unique.
"There are some really hard crime families in that area like there are in other areas. There is family violence," he says. "But I don't consider it to be more severe in Papakura than anywhere else."
Glossop says the challenge for police is where crime is intergenerational they need to show families there is a life beyond violence, which can be hard when people know little else.