A federal judge dismissed with prejudice today a closely watched criminal case against international pharmaceuticals businessman Zhenli Ye Gon, who had been accused of participating in an international drug trafficking conspiracy.

Judge Emmet Sullivan of the U.S. District Court for the District of Columbia agreed to dismiss the case based on a motion by Paul O’Brien, chief of the Justice Department’s Narcotic and Dangerous Drug Section. O’Brien said that because Ye Gon faces prosecution in Mexico where he is charged with organized crime and firearm and drug violations, the U.S. government did not plan to pursue its case against him.