Do you worry that you're being watched?

If you drive, you probably are.

My new video covers the cameras that photograph the backs of millions of cars.

A company called Flock has 80 percent of that market.

Flock's CEO says the goal is to "eliminate crime."

But lots of people hate the cameras.

"We are asked to give up our privacy for really nothing in return," says ACLU lawyer Chad Marlow.

"These cameras save lives," I push back, "catching criminals."

When a car thief kidnapped a child in Atlanta last month, Flock cameras helped police find the car and arrest a man within 15 minutes.

Marlow says, "That car could and would've been found anyway without violating the privacy rights of every single person in America ... Surveillance doesn't actually deter criminal activity, with one exception, car thefts in public parking lots."

"I hardly feel like my privacy's invaded," I tell him. "It's just my license plate number. Anybody can see it."

Marlow replies that today, AI lets police use that photo to learn much more about us.

"The data they collect when combined with........

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