BEJUMA, Venezuela - In this deceptively tranquil farming village, people still talk about the ''Bejuma massacre'' in a whisper, partly because one man who spoke out is in a grave, partly because the killers were allegedly policemen. But the source of the fear can be summed up in a single word: drug trafficking, on the kind of massive level and involving corrupt government officials that has long been a profound problem in neighboring Colombia. Drug seizures in Venezuela doubled in the past four years. There are mounting allegations of drug-fueled corruption at the highest levels of the security forces, accompanied...