Consumer journalist and investigative reporter John Stossel ponders a world where drones are mainstream. The tiny flying machines, equipped with a camera, can be bought as cheaply as $1,200, and are a boon to farmers and real-estate agents. But do they pose a serious problem of privacy when in devious hands? Stossel talks with Kentucky U.S. Senator Rand Paul and others about the pending dilemma in this edition of Liberty Pen.