Originally Posted by
tdracer
Foreign nationals who didn't go through immigration on the way in may find themselves with a problem when they try to leave - not having the passport stamp or any associated paperwork...
The lack of an entry stamp on paper can be easily solved by "losing" one's passport and asking the nearest consulate/embassy to issue a new one... the harder bit is whether the US CBP would deem a person to have entered the country throug illegal means