itsbrokenagain;
That info came from the guys that make the licenses in OK City. I tried to get them to publish a letter, like the "English Proficient" one, on their website to help get the foreign civil authorities to understand why it was put in the limits section.
They gave me some contact info, up their chain of command. I finally got the the walking talking proof the the "Peter Principal", and he got defensive and angry that someone in the world would question his wisdom.
That is all I know. I had to clarify this with 2 different (Vietnam, and China) civil authorities when I was looking for a job 4 years ago.