"President (Alvaro) Uribe said he would consider having Colombian workers have microchips implanted into their bodies before they are permitted to enter the United States to work on a seasonal basis. I doubted whether the implantation of microchips would be effective since the immigrant worker might be able to remove them." — Sen. Arlen Specter, Republican, April 26, 2006, after returning from an official visit to Colombia

(via)