Danielle and Alexander Meitiv of Maryland want to raise their children as "free-range kids," which is to say giving them the kind of range of movement that those of us over 30 recall as a normal part of childhood.

One of my cherished childhood memories is the long walks my best friend and I would take home from church through New York's Riverside Park, which Google Maps records as a distance of 2 km, stopping at every playground along the way.

This is slightly longer than the walk home from the playground that caused Montgomery County's Child Protective Services to investigate the Meitivs last year, after someone called the police to report the alarming sight of ... children walking down the street alone. On Sunday, after another "good Samaritan" called the cops, CPS seized the children, leaving the parents frantic with worry for hours.