I always carry my valuable chips on board; ship the rest. But in 1997-or 98 when I left via McCarran, I was stopped by Security and asked to open boxes - where the man found chips in air tights; he asked what I was doing with them; I told him who I was and what I had been doing with them; he called over his superior; and both examined them. I had a copy of the program in my brief case which I showed them and they "allowed" me to pass. They didn't tell me why they were checking me out--maybe they thought I had stolen them off the tables.