A few weeks ago I was crossing the border (by car) from Canada back into the US. I had to go into secondary to take care of some paperwork and overheard a very interesting conversation between an American couple and a USCIS officer. The officer asked the couple to confirm a few recent trips: Rio, China, Paris and perhaps a few more that I did not quite catch. I also overheard that they lived in California and had flown up to Seattle for the weekend to visit relatives, and while they were up here, took a drive to Vancouver as well. The officer basically wanted to know why did the couple travel so much, but for such short periods at a time? The husband said that he was a physician and it was hard for him to get much time off, but when his wife found a good fare to different locales, they would go visit. (I recall they said they were in Rio for 5 days, which doesn't seem unreasonable to me!) The officer flat out told them that they fit the profile of people doing something illegal because of their short trips. My question to the forum is -- has anyone ever had this kind of trouble when returning back to the US after a mileage run? Or perhaps when arriving in a foreign country and explaining that you're only going to be there for a few hours?