It's a Gas!

A couple of days ago, a man came to my in-law's apartment complex in India, fogging up the place with what I was told was a cloud of DDT. He walked through the common areas, including the main courtyard and areas around the building.

India is the largest user if DDT today, according to Wikipedia, although it is supposedly only used in small indoor applications.
I wonder to what extent DDT is also used unofficially. I wouldn't be surprised if there is a large black market for the stuff.