By the time we learn it is too late. We need to remove the threat now, deport all foreigners who fit the profile of a terrorist, revoke all student visas, close the borders for 6 months to a year to get a handle on the problem. Close university research on anthrax and any other possible bio-terrorist hazards. Start acting like a country that is at war.
Thanks.
First, waiting nearly a month before counter attacking.
Second, the food drops on Afghanistan.
Neither of those things are crushing. Doing the unexpected is what is required for us to nip these guys. Deportation? It could fall under 'unexpected'...however, he may have cells here which have taken a citizenship oath. That what we have to wonder.