Do you have a source for this? All the reports I have seen point the opposite, modern current Bolivian Venezuelan govs have seen a dramatic fall on drug trade, there was even an apalling graph from US senate where it showed that the bulk of drug trade left LATAM through Colombia and the Pacific Coast vs Venezuela, but still US gov PR line has been insistent on tarnishing the global reputations of said countries because they oppose US hegemony in the region