FBI Background check is not really accurate. I am from Iran. They can't really check the background of people form Iran and North Korea because those government

FBI Background check is not really accurate. I am from Iran. They can't really check the background of people form Iran and North Korea because those governments do not help FBI for background check. All they can access to is international flight information and anything outside of those countries. I saw an Iranian man in Ankara who were rejected for Green Card Lottery visa because he had a trip to North Korea (Iranians can go there without a visa). In a private talk he admitted that he was working for army and he was educated for missile stuff in N. Korea. My point is, if he never went to N.Korea, he could have make it to the US. Someone who worked for Iranian Missile Program. FBI background check is not accurate.