hehe, I don't know the details. he used "Muhammed" as

the example. "Zhang" is just an example. In your case, probably someone has the same last name as you might have done something "bad" in the past and caught by the system. And he also recommends, if there's any problem for a case, applicant can always ask for help from State Congressman or Senator. Then the case will be passed to his hand. He handles immigration case passed by Congressmen or Senators. I was really suprised.