Some parents are worried day care centers will use the technology to replace staff. Others wonder whether it’s violation of personal integrity to make a child put on a GPS transmitter.

Monica Blank-Hedqvist, the principal of a daycare center in the city of Borlange, says the system is “excellent.” She says her staff have been using such devices during walks in the forest: the kids wear vests with transmitters that staff can track on a screen.

Sweden’s Data Inspection Board says it may investigate the matter.