More than half of the cocaine shipped through Mexico now lands in the south, Mexican officials say.
The Medellin group is said to be responsible for up to 80 percent of the cocaine shipped into the United States.
It is no harder for traffickers to ship semi-refined cocaine to the United States than the finished product.
In 2007, 30% of all cocaine shipped to the UK was estimated to come from West Africa.
In the early 1980s, the majority of cocaine shipped to the United States that arrived at Miami came through the Bahamas.
He met them in Switzerland three months ago, and he was working to get them to ship him cocaine through the port of Odessa.
The authorities charge that Mr. Villanueva took a $500,000 bribe for every 500 kilograms of cocaine shipped through his state.
Colombian drug barons accumulate such vast resources that they can acquire a Soviet submarine to ship cocaine to the United States.
The Southwest border is the overland entry area that Colombian drug organizations use to ship cocaine to the United States.
He was sentenced to three years in prison for his part in a conspiracy to distribute cocaine shipped to Cincinnati via FedEx.