NERVE agents such as sarin and vx can kill quickly in low doses. Kim Jong Nam, half brother of Kim Jong II, North Korea's leader, was recently murdered by having vx smeared on his face at Kuala Lumpur airport. Though the use of nerve agents is supposed to be banned by treaty, governments and terrorists have deployed them, and may do so again in the future. At the moment, there is no simple way for soldiers in the field, or inspectors looking for manufacturing and storage sites, to detect nerve agents. The electrochemical sensors involved are bulky and awkward to use.
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