Say that Syria was to use this gas in Washington DC.You can not smell it.How is someone to know if the gas is around?
Sarin, the deadly nerve gas which the United States says was unleashed last month by the Syrian regime in a Damascus suburb, was developed by Nazi scientists in 1938.
Originally conceived as a pesticide, sarin was used by Iraqi dictator Saddam Hussein's regime to gas thousands of Kurds in the northern town of Halabja in 1988.
A cult also used the odorless, paralyzing agent in two attacks in Japan in the 1990s.
US Secretary of State John Kerry on Sunday said tests on hair and blood samples taken from the emergency workers who rushed to the scene of the Damascus attack on August 21 had shown indications of sarin.
He said the samples had been given to the US independently, outside of an outgoing UN probe.
Washington has squarely blamed the Syrian regime of President Bashar al-Assad for the attack, which it says killed more than 1,400 people including hundreds of children.
Inhaled or absorbed through the skin, the gas kills by crippling the respiratory center of the central nervous system and paralyzes the muscles around the lungs.