U.S. Citizenship and Immigration Services (USCIS) recently released policy guidance on accommodating religious beliefs during fingerprint and photograph capture. Among other things, the guidance notes that USCIS will accommodate an individual who wears headwear as part of his or her religious practices. Religious headwear may be worn if a reasonable likeness can be obtained from an individual, the full face is visible, and the religious headwear does not cast a shadow on the face. If removal of headwear or adjustments are needed, such as a same-gender photographer or fingerprint-taker, USCIS will offer a private or screened area, if available. If such an area is not available, USCIS will offer to reschedule the appointment.
The notice is available here.