回复：8老师，请教您申请白皮书问题

我拿绿卡只有六个月，家里老母生病，想回国一年多。申请白皮书， 可是还没接到通知摁手印，已买机票下周走，我可以回中国再吗摁手印吗？
-You can come back to US to do the biometrics. Or you may just go to the USCIS ASC to see whether they allow you to do the biometrics by bring the I-131 filing receipt even if you don't have the appointment notice of biometrics yet. Bring the proof of your mother's illness, if possible. If they don't allow you to do it before you get the appointment notice, then you need to come back to US to do it after you get the USCIS biometrics appointment notice.