I know one guy back from Nepal who came to U.S around 10 yrs ago and went home after completing his course but failed to pay the due amount to banks after using credit cards. He went home but when he applied to US again, he was rejected.The reason was simple, he cheated  and they could pull his records. He has been to many countries but not in US after that. Many of his collegues have already came to US  2/3 times for training purpose except that guy.So be careful and look your future..