By Samantha Schmidt and Diana Durán of WashingtonPost BOGOTÁ, Colombia — It’s the largest producer of cocaine in the world, the source of more than 90 percent of the drug seized in the United States. It’s home to the largest Drug Enforcement Administration office overseas. And for decades, it’s been a key partner in Washington’snever-ending “war on drugs.” Now, Colombia … [Read more...] about Colombia, largest cocaine supplier to U.S., considers decriminalizing