Prior to his capture this year, Sebastian Marset was reputed to be one of the world’s most prolific drug traffickers, allegedly sending mountains of cocaine — 10 tons or more per shipment — from South America to Europe.

A native of Uruguay, where authorities say he proclaimed himself “King of the South” and led a criminal network dubbed “Primer Cartel Uruguayo,” or the first Uruguayan cartel, Marset, 35, has been described in some media reports as his country’s version of Pablo Escobar.

But unlike the infamous Colombian kingpin, who flooded American cities with cocaine in the 1970s and ‘80s, there is little evidence to show Marset ever moved any product to the United States.

And yet for six months, Marset has been…