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.