QUOTE(YuAndDan @ Nov 20 2007, 05:43 PM)

USCIS is part of Homeland Security which also oversees Customs and Border Protection (the POE) every time you enter and exit the USA they scan your passport, and record your time that way. DHS shares this info with the consulate.
http://www.visajourney.com/timeline/profile.php?id=41985thanks for the response, but honestly, how affective is this system? maybe I'm wrong, but I have heard they usually don't have a clue considering all the glitches and screw ups.