How were the kids in this town contaminated?

For children in Port Pirie there is no 10 second rule.

When you grow up in a “lead town” eating off the floor is forbidden, and could be harmful to your health.

But when a mum follows all the strict and unusual rules of the town to keep her son safe and his blood lead still continues to rise, she asks: what am I doing wrong?

Can a town coexist with a lead smelter?

Paul Culliver investigates