The 2001 Anthrax attacks have yet to be solved and the case is still open.
I think this is something some of us know but the details of the article will interest you. For the sake of conjecture, I’d posit there are several possible scenarios here:
1) The FBI simply can’t solve the case. Either the crime was committed too well or the FBI and other government agencies screwed up. No big mystery or conspiracy. Just incompetence. (an all too frequent explanation of government behavior)
2) Someone in the USG knows or has a very good idea who the perpetrator(s) was/were but is unwilling to acknowledge it and is perhaps impeding the investigation due to the ramifications. E.g. it could be another state such as Russia or North Korea in which case the US would have to declare war, or perhaps an alleged ally like Saudi, or rogue elements from within an allied state?
3) The USG wants the public to believe the case is closed while it continues to investigate quietly to avoid embarassment.
Readers, any further theories?

Comments to this entry
Curzon
January 25, 2010
2:06 pm
http://articles.latimes.com/2008/aug/01/nation/na-anthrax1
Joe Jones
January 25, 2010
2:10 pm
[...But seriously, I'm inclined to believe that it's incompetence, plus the fact that they have bigger fish to fry (or rather, not fry, in the case of bin Laden).]
Chirol
January 25, 2010
2:45 pm
But to make it mroe credible, we should throw a big corporation in there, preferably an oil company.
Chris Swanson
January 25, 2010
8:18 pm
Failing that, though, I'm guessing the most likely explanation is "stuff happens". Sometimes it can take quite a while to work these things through, but we might still have someone found guilty yet. It took something like 20 years to snag the Green River Killer, but they finally found him, so you never know.
kurt9
January 25, 2010
10:22 pm
The FBI has screwed up like this before. There was a muslim lawyers here in Portland that the FBI actually tried to frame for the Madrid bombings when it was clear from the evidence given by the Spanish authorities that this guy could not have been involved. This lawyer eventually collected $2 million in a wrongful prosecution suit against the FBI.
Alfred Russel Wallace
January 25, 2010
10:44 pm
kurt9
January 25, 2010
10:51 pm
Bob Harrison
January 26, 2010
4:44 am
Brent
January 26, 2010
12:23 pm
You are correct, but I have since seen stories that cast serious doubt on whether that guy really could have been the culprit (as Kurt9 points out). I'd go with number 1 (skilled perpetrator). I would not got with FBI incompetence. I know several current and former FBI agents - they are highly trained, motivated, professional, well funded and intelligent. Really, they are the cream of the crop and we are lucky to have them. So, while I agree that Chirol's "lazy or incompetent government employee" paradigm applies most of the time, it does not (generally) with respect to the FBI.
Curzon
January 26, 2010
1:25 pm
PaxAmericana
January 27, 2010
9:50 am
Those of us from the Machiavelli school of politics expect the worst out of all powerful groups, and that most definitely includes ones in the US. And, this problem of criminality and betrayal within all governments is helping to lead the world to anarchy.
Achariyth
January 28, 2010
12:37 pm