Interestingly, I've been getting a few visits to my site by people who link in from www.amesstrain.com where some guy supposedly has a screenplay about the anthrax attacks for sale. I say "supposedly," because it looks more like a site where he just promotes his beliefs about the attacks.
The problem with writing a screenplay about the anthrax attacks is that doing so requires that you believe that the case will never be solved -- at least anytime in the next two or three years. I'm not at that point yet.
That's required because making a movie will take at least year or more, and if the case were solved during that time it could make your movie out-dated before it is released. And everyone involved could lose a bundle of money.
It would also take a lot of ingenuity to write an interesting screenplay about a case that has dragged on for over six years without a resolution.
Personally, I'd like to see the case solved so I can write an update to my book where I explain how I figured everything out. When finished with that, then I might try writing a screenplay about the case to add to my list of screenplays.