Forty-one states and the District of Columbia have laws that make it illegal to text while driving. Six others forbid new drivers from texting behind the wheel.
But that doesn't stop drivers from doing it — and enforcing those laws can be difficult.
On a highway north of New York City, state Trooper Clayton Howell is in an unmarked SUV. He's looking for drivers who are texting or using hand-held phones, which is banned in New York, along with 11 other states.