Based on all the theories we see, we can imagine the theories, the evidence, the intelligence that is going around the government. If there was a threat of thousands of packages being mailed simultaneously - expect the postal service to be shut down as was the air traffic on the day of attack. Inconvenient to everyone - yes - but it will be done - it would have to be done. But, they don't have to mail this stuff - it could easily be sprinkled anywhere - in the stores, the malls in some form that when our people walked over it, it breaks open the package and the stuff disperses or any other scenario - tons of them.
Remember how Bush does things - carefully, thoroughly and after looking at all aspects. That is what they are doing now. They are fighting - BUT - they are evaluating constantly and carefully, thoroughly yet a bit slowly working through this.
When they act - it will be the most advantageous based on the knowledge they have - right or wrong - it is the best they can do with what data they have. We just have to continually pray for the Lord to give them wisdom in these matters. With this team we don't have to worry about rash reckless action - it will be well researched and thought out.
And then, another wave of letters could be mailed. And so on.
Another means of attack would be the glass jar "anthrax bomb" tossed onto subway tracks to be spread by the wind rush, or tossed against ventilator intakes of buildings.