Twenty-one thousand Pakistani rupees for a four-kilo package, the farmer said, and he harvested three to four kilos per jirib (a local land measurement equivalent to about half an acre).

NEWYORKER: The Taliban??s Opium War

"He told me I will give 200, 000 Pakistani rupees for a teacher's death, 500, 000 for burning a school, and 100, 000 for throwing acid on a schoolgirl, " Jalil said, seeming frightened and agitated as he looked into the camera.

CNN: Afghan girls maimed by acid vow to go to school

Then everyone pulls out currency - Pakistani and Indian rupees, Sri Lankan rupees and US dollars - in an attempt to prove their innocence.

BBC: Sri Lanka - hub for human trafficking