Despite American allegations that Chavez' Venezuela is aligned with drug traffickers, Chavez' government says that it actually is fighting drugs.
Whatever the truth of these competing allegations may be, note that, in particular, Venezuelans assert that their having installed a new radar system has slowed cocaine smuggling via airplane to Africa.
Meanwhile, recently reports have surfaced to the effect that much less cocaine is now being smuggled through Africa. These reports may be faulty, and it is difficult to cite any reason why this slowdown should have taken place. However, if they are correct, then the Venezuelan radar would be one of the few plausible explanations for such a slowdown.