[RANGERAIRBORNE]

OK, my days of college microbiology are long behind me- but it still seems to me that this "powder" could be Gram's-stained and at least identified as being consistent with Bacillus anthracis spores or just lactose or talcum powder.

[bonesmccoy]

nah... there's lots of gram positive bacilli which are spore forming. You can't positively ID the bug without doing either micro bio lab studies or DNA PCR.