One afternoon this past April, a Florida mom and dad I'll call Cindy and Fred could not get home in time to let their 11-year-old son into the house. The boy didn't have a key, so he played basketball in the yard. He was alone for 90 minutes. A neighbor called the cops, and when the parents arrived—having been delayed by traffic and rain—they were arrested for negligence.

They were put in handcuffs, strip searched, fingerprinted, and held overnight in jail.

It would be a month before their sons—the 11-year-old and his 4-year-old brother—were allowed home again....