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因为妈妈现在重病在床，偏瘫，不能走路。到时候打指纹的时候必须亲自去吗？

-Yes. The biometrics cannot be waived because it is used for background check and green card production. But it is possible that your mother can request interview waiver if her health does not allow her for the interview.

如果不能去那有别的办法吗？

-Request reschedule.