Could be true. A friend of mine went on a rtw trip with some unusual stops, like Ethiopia and Myanmar. He got pulled out for extra screening in Bkk and hkg, and when back in the U.S. Got a nice long interrogation about where he had been and why. They told him they had been watching his movements and told the authorities overseas where he was going to be in the lookout for him.

His wife, who is Swiss and was with him the whole time, got none of that.