Do you remember that old woman in some state where there was no anthrax detected anywhere, yet she died of it?
They went through her mail, etc., couldn't find it.
And wasn't there another case in NY, where they couldn't find where someone got it from?
It sure sounds like we can't detect it in really small quantities.
Also -- how many others may have gotten ill and even died, without it being attributed to anthrax?
"And wasn't there another case in NY, where they couldn't find where someone got it from?"
http://www.cdc.gov/ncidod/EID/vol9no6/02-0668.htm
I remembered this case. I'm a veteran from where this lady came from, i.e. Vietnam, a native born New Yawker and still a current resident. IIRC, there was a story in the NY Times that suggested it was airborne anthrax that rode on the prevailing wind pattern from the Franklin Park, New Jersey Post Office over New York City.
Yes, Connecticut. She was the last known victim of the attacks. The other lady in New York worked at a hospital in Manhattan. Neither woman had any known contact with the anthrax letters, so eventually authorities said they thought it was from cross-contamination in the mail centers. However, they could never prove it whatsoever.