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" ... The test on the City of San Francisco had been performed using the non-pathogenic biological warfare agent simulant called Bacillus globegii. The microorganism caused no ill effects in humans or animals but its spores approximated those of deadly Bacillus anthrasis, the causative organism of Anthrax. By daybreak on September 20th, a handful of scientists from Fort Detrick began swarming over the San Francisco area where they were busy collecting hundreds of all-glass impinger air-samplers from the government offices and warehouses where they had been covertly installed before the test. The air samplers had faithfully monitored the dispersion and concentration of the simulated biological weapon aerosol. ... "