"USCIS provides immigration relief to victims of various
crimes—including domestic violence and human trafficking—by granting one
of two forms of relief: T nonimmigrant status and U nonimmigrant status. Principal victims granted T or U nonimmigrant status may additionally
apply or petition USCIS on behalf of overseas family members for
derivative T or U nonimmigrant status so that these family members can
join them in the United States. Before family members of principal T or U visa holders can enter the
United States, they must first undergo processing with the U.S.
Department of State (DOS) at a U.S. Embassy or Consulate to obtain a T
or U visa abroad. This is known as consular processing. USCIS will decide on the basis of the application or petition filed by
the principal T or U nonimmigrant status holder whether an overseas
family member qualifies for derivative T or U nonimmigrant status. DOS
will then separately determine that family member’s eligibility to
receive a visa in order to enter the United States. ... " - USCIS, Apr. 6, 2012.