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因為媽媽現在重病在床，偏癱，不能走路。到時候打指紋的時候必須親自去嗎？

-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.

如果不能去那有別的辦法嗎？

-Request reschedule.