Flag it down or walk on up. There is a mobile DNA testing truck driving around New York City, reports CBS New York. The truck mainly caters to people trying to ascertain a child's paternity, and the tests cost between $299 and $575, CBS adds. "They flag us down, they pull us over, they talk to us," Jared Rosenthal, the owner and operator of the Who's Your Daddy? truck, tells CBS. "Sometimes, because of the nature of the services, they want to be a little more discreet about it, but they do come or they'll call the number."