‘(B)(i) Upon application by an alien who is citizen or national of Mexico, and who is applying for admission as a visitor under section 101(a)(15)(B) from Mexico, the Department of Homeland Security official in charge at a port of entry may, in the exercise of his or her discretion, on a case-by-case basis, waive either or both of the documentary requirements of section 212(a)(7)(B)(i), if satisfied that the alien is in possession of proper identification, as provided under clause (ii), and--
‘(I) is a child coming for a regular medical appointment (as evidenced by proof such as a letter from the medical professional concerned), or is the parent (or other adult chaperone) accompanying such a child, except that the number of adults admitted under this subclause shall not exceed one per child;
‘(II) is a child coming with a student group to participate in an educational or cultural event (such as an athletic or academic event, a concert or other artistic performance, or a visit to a recreational, touristic, or historical site) for not more than 1 day (as evidenced by proof such as a letter of invitation issued to the group), or is an adult chaperone, such as a teacher, coach, or parent, accompanying such a group, except that the number of chaperones admitted under this subclause shall not exceed that sufficient to supervise the group involved; or
‘(III) is a child coming to participate in a special community event that traditionally has been attended by individuals from both sides of the border (as evidenced by proof such as a public letter of invitation issued by the community concerned), or is a parent or other adult relative accompanying such a child.
‘(ii)(I) For purposes of this subparagraph, in the case of a child, proper identification shall include a passport, birth certificate, or other proof of citizenship or nationality.
‘(II) In the case of an adult, proper identification shall include a passport, birth certificate, or other proof of citizenship or nationality, and a government-issued driver’s license, or similar document issued for the purpose of identification, that contains personal identifying information and a photograph.
‘(iii) For purposes of this subparagraph--
‘(I) the term ‘child’ means an unmarried person under 16 years of age; and
‘(II) the term ‘adult’ means any person who is not a child.’.