A shocking exposé reveals how a secretive Customs and Border Protection division investigated as many as 20 journalists and their contacts by using government databases intended to track terrorists. Those investigated include the Pulitzer Prize-winning Associated Press reporter Martha Mendoza, along with others at The Huffington Post, The Wall Street Journal and The New York Times. We speak to Jana Winter, the investigative correspondent who broke the story at Yahoo News, who says it’s unclear if the surveillance program was discontinued. “These were career officials who are still running this secretive unit with no rules and no procedures for how…