Researchers will track the movement of harmless tracer gases. They'll place air sampling devices in specific areas on the street and within the subway system. The gases mimic how a chemical or biological weapon may react if released.
Police Commissioner Raymond Kelly said the study will help safeguard the city against attacks
bullshit ... those gases are designed to attach themselves to human hair so the government can follow people home and kill their freedom.
No doubt made by Monsanto and DuPont and Dow using genetically modified organisms and not properly tested. It's all part of a conspiracy to sap and impurify all of our precious bodily fluids.