A new US law requires cameras in all new cars that watch the driver's face — bad news for anyone who thought their car was private.

• Congress passed a rule mandating driver-facing cameras in every new passenger vehicle.
• The cameras judge what the driver is doing — eating, yawning, or anything else.
• The stated reason is safety.
• The practical effect is that private conversations inside your own car are no longer private.

Outlook: Expect the surveillance requirement to roll out with new models, with privacy pushback likely to follow.