Then, the researcher asked questions like “In the last 12 months, did you kill any leopards?,” and before the farmer answered, he rolled the die. If he rolled a 1, he should say “no,” no matter what the correct answer was, and say “yes” if he rolled a 6. For all the other numbers, he should answer honestly. The fact the researcher never had any way of knowing whether the farmer was saying “yes” because it was the truth or because he rolled a 6 gave the subject a sense of safety.
What an awesome way to get an honest answer: find a way to assure anonymity while looking them right in the face.