“Evidence of Admission
An Arrival/Departure Record (Form I-94), including a replacement when appropriate, is the most common document evidencing a noncitizen’s admission. The following are other types of documentation that may be accepted as proof of admission into the United States:
- Admission stamp in passport, which may be verified using DHS systems;”
其实你母亲这个类型只需要证明她合法入境。合法入境的定义就是移民官看到她而且让他进入。就算她没有入境证件或移民官没有给他身份也是算合法入境。入境章就足够证明移民官看到了她而且让了她入境。所以足够证明合法入境。
如果真的要入境记录，可以做FOIA request。但是这个会耽误时间。
