A mother recalls a temporary lapse in judgment and how it has affected her as a parent:

Over the past two years, I’ve replayed this moment in my mind again and again, approaching the car, getting in, looking in the rearview mirror, pulling away. I replay it, trying to uncover something in the recollection I hadn’t noticed at the time. A voice. A face. Sometimes I feel like I can hear something. A woman? A man? “Bye now.” Something. But I can’t be sure.

We flew home. My husband was waiting for us beside the baggage claim with this terrible look on his face. “Call your mom,” he said.

I called her, and she was crying. When she’d arrived home from driving us to the airport, there was a police car in her driveway.