You're relatively new here so I'm trying to be polite, but it's pretty clear you have no idea what you're talking about. For starters, the guy's name is Hatfill, not Hatfield. Second of all, if you were really following the case closely you would know that they've been investigating him for almost three years now, and not only can they not bring an indictment on him, he's in the process of suing the government and they're doing everything they can to stall the process. And if you know anything whatsoever about crime and law enforcement, you know that mass murderers aren't usually in the habit of suing investigators.
The FBI is not all-powerful my friend, they actually make mistakes sometimes, and they've made a huge one here in this case by persecuting this guy who doesn't even have any formal scientific training with anthrax (or bacteria for that matter). They made the mistake of listening to some left-wing reporters and journalists with an apparent political axe to grind, and the day is going to come eventually when they're going to have to come clean and admit that they really screwed this up.
If you're going to survive here at Free Republic, take my advice and try not to believe everything you read in the newspapers, because people who do that are fools.