The anthrax investigations? It was the big follow-up in the media to the attacks of 9/11 until it got bumped by the Enron scandal. I recall a fellow by the name of Steven Hatfill being described by Attorney General Ashcroft as a "person of interest". That had to be one of the most bizarre euphemisms ever created. I suppose "suspect" is just too close to an accusation, even though you can watch a two hour chase that started with a car jacking, and as soon as the guy is in the police car, he is only a "suspect".