WASHINGTON - A Chinese-Mexican businessman produced tons of the main ingredient in methamphetamines, knowing the drugs were destined for the United States, according to a federal criminal complaint obtained by The Associated Press. Zhenli Ye Gon, tied to what U.S. officials say was the world’s largest seizure of drug cash, was facing charges Tuesday that he smuggled drugs and laundered the profits from drug sales at casinos in Las Vegas casinos and elsewhere in the United States. Ye Gon lost more than $125 million gambling in Las Vegas since 2004, U.S. drug agent Eduardo Sanchez said in an affidavit that accompanied the complaint filed in U.S. District Court in Washington.