[DWSUWF]

I'm guessing those high speed sorting machines occasionally swallow a piece of mail. And I'm assuming that a letter with a wad of loose powder in it would be a prime candidate to get shredded.

They clean the machines with compressed air, to blow out the accumulated debris, and Bingo! millions of anthrax spores in the air in a relatively confined space.

It's going to get worse.

[jonathonandjennifer]

They clean the machines with compressed air, to blow out the accumulated debris, and Bingo! millions of anthrax spores in the air in a relatively confined space.

I vote this the scariest reply on this thread. The thought of blowing accumulated dust out of a machine in a crowed mail room - I'm surprised everyone in that room doesn't have anthrax.