There are limits on people who are allowed to leave North Korea. You have to have permission. Only certain people are allowed to go. There is usually an effort to have someone keep an eye on them. You never meet with a North Korean alone; you always meet with two North Koreans, and they report on you. I think that's part of how that process works, but I think it's worth doing.
On October 25th, 2012. See this statement in context.