Actually, I just guessed. When I got turned down, I asked the agent who was interviewing me why, and and just looked at me and said "is there anything in your background you can think of?" I've never been convicted of a crime, so I just thought that being in North Korea might be the reason. I told him that, and he just said "Well, you can write the ombudsman and explain it and they might approve you." So he didn't really confirm my suspicion, but I could kind of tell by his body language that I was probably right. When I wrote my letter, I said "The only thing that I think could cause a denial was my trip to North Korea in 2007.." and explained it from there.