They said there is no lethal agent that works as a white powder.
From the sacbee.com
Mustard is not considered a lethal agent, but an incapacitating agent, causing only 3-5% mortality.
From the en.wikipedia.org
Sarin is an extraordinarily lethal agent.
From the infowars.com
A lethal agent is designed to injure or incapacitate the enemy, or deny unhindered use of a particular area of terrain.
From the en.wikipedia.org
Mirren arrives fairly late in the story, as a lethal former agent for MI6.
From the sfgate.com
He said sarin, a lethal nerve agent, was probably used.
From the bostonherald.com
In the Moscow stand-off, FSB Spetsnaz forces stormed the buildings on the third day using a lethal chemical agent.
From the en.wikipedia.org
The chemical is thionyl chloride, which is used in pesticides and plastics, but is also needed by the Army to make sarin, a lethal nerve agent.
From the time.com
According to intelligence-based reports in the mid-1990s, Syria had accumulated hundreds of tonnes of skin-blistering mustard gas and sarin, a lethal nerve agent.