Fingerprints will then be analyzed by the FBI, usually within a month. If you get an additional biometrics appointment notice within the next few weeks, don’t panic — this is commonly due to smudged prints, and fingerprints will need to be retaken to complete the background check. USCIS will not charge an additional fee for any further fingerprinting work.
If the FBI flags or rejects your biometrics, you will be required to present police clearance reports from every state or country you’ve lived in proving that you do not have an extensive criminal record.
USCIS biometrics are valid for 15 months. If your application is not processed within 15 months, USCIS will most likely send another notice for a biometrics appointment.