Hello Stuart Jonas Reich (Level 7):
Thank you so much for your quick response. My friend arrived in the US in Dec 90 and left Dec 91 (1 year). He only worked for 3 months (Sept-Nov 91).
I heard that back then USCIS had a different computerized system, therefore there was no way to know if a person stayed longer or not when returning home. I'm saying this because he has returned to the US after that many times without any problems. As a matter of fact, he returned in Dec. 94 and they never questioned him about his previous overtime stay.
His concern is, if he doesn't mention this 3 months work on his L1 form, would USCIS find out through his SS # I also understand that USCIS work together with SSA - so can USCIS get his work history? Could his working visa be denied?