Wachovia Corp. is involved in a federal investigation launched by the Department of Justice that targets money-laundering by drug organizations, according to The Wall Street Journal. The Charlotte, N.C., company is under scrutiny for its involvement with Colombian and Mexican money-changing establishments known as “casas de cambio,” located along the Mexican/U.S. border. These organizations may be used by drug cartels to launder their money. One such exchange, Casa de Cambio Puebla, a Mexican chain, was recently the subject of a court case in Miami in which $23 million in assets were seized. The money was spread out over 23 Wachovia...