What happens if USCIS rejects an N-648 disability waiver request?
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What happens if my N-648 waiver is denied? If the N-648 waiver is denied at the naturalization interview, USCIS will proceed with the interview as if you had not submitted a Form N-648. USCIS will provide you with an opportunity to take all portions of the English and civics requirements.
What kind of disabilities qualify for the waiver citizenship?
Who is eligible for a disability waiver? The applicant must have a medically determinable physical or developmental disability or mental impairment that causes the applicant to be unable to learn English and/or U.S. history and civics. The disability is expected to last at least 12 months.
Can a disabled person apply for U.S. citizenship?
Medical Disability Exception Requirements. The English and civics requirements do not apply to naturalization applicants who are unable to comply due to a “medically determinable” physical or developmental disability or mental impairment that has lasted, or is expected to last, at least 12 months.

Does N-648 need to be sealed?
After completion of the medical examination, the civil surgeon will give the applicant, the completed Form N-648 in a sealed envelope. The Sealed Envelope is Opened only by USCIS officials. The Seal should Never be Broken by the Applicant , his or her lawyer or any other Individual.
Does N 648 need to be sealed?

How long is the N 648 valid for?
9 It does not expire after it is submitted. 10 Even though current naturalization application processing times have increased to over 12 months at many Field Offices (see https://egov.uscis.gov/processing-times/), the N- 648 remains valid.
What is the purpose of N-648?
Use this form if you are applying for U.S. citizenship and need to request an exception to the English and civics testing requirements for naturalization because of physical or developmental disability or mental impairment.