Dr Baruah (whom God Preserve) of Assam

"Look at this," said Dr Anuj Baruah, holding up a vial containing a few drops of rusty red liquid. "With this I could make you senseless." His nose started twitching; his eyes watered. "Oh dear. I think I may have got some on my fingers," he said, looking remarkably unconcerned that his skin had touched something the Indian government has developed into a biological weapon.

"I know what happens. Your brain starts to not work properly, you become restless … " He scurried off, returning a few minutes later after washing a particularly pungent strain of bhut jolokia chilli concentrate off his hands on his farm-cum-chilli research lab in the north-east Indian state of Assam.

.............. you could, for example, "blast a container of capsaicin into a terrorist hideout and make them all drop their guns when they take just one breath." 

The Strabismus of the East.