This paper makes an attempt at testing the external validity of corruption experiments by moving from the lab in a developed country, to where it matters the most, the …eld in a developing country. In our experiment a candidate proposes a bribe to a grader in order to obtain a better grade. We …nd the direction and the magnitude of most treatment e¤ects to be statistically indistinguishable between the lab and the …eld. In particular, increasing the graders'wage reduces in both environments the probability to accept the bribe. Finally, we identify several micro-determinants of corruption (age, religiousness, ability). We would like to thank the recruiting …rm Opty-RH for its help with hiring subjects in Burkina Faso. Finally, the authors gratefully acknowledge …nancing from the CRSH. As always, all remaining errors are ours.