Could Antrax be living in the enviroments that we have been testing, for months or years before the letters? What I'm saying is that a lot of places that the gov't has checked have come up positive with Antrhax, but there have been no new letters. Plus I doubt that spores have jumped from one envelope, to those only adressed to important places. Is it possible that we are finding organisms that have occured naturally, but not tested for before? Maybe not all of the detections aren't actually terrorsts.