How can you avoid signing ‘an incomplete form’ when so much problems can be caused by marking a checkbox? How can you avoid someone doing that after the fact?
I think he should have checked the fourth box. [IANAIL]
If someone else completed this, the problem is that to check the fourth box you must add some "Alien or Admission number" that the other person didn't know. It's easier to check the first box that doesn't ask more questions.
