A Clearance Letter is a document that contains information about your clean criminal record. These letters are sometimes needed when applying for a visa, other travel purposes, or when adopting a child.
Administered by the Department of Homeland Security, a U-Visa allows immigration protection for victims of qualifying crimes and their qualifying family members (as appropriate), who are helpful to law enforcement in the detention, investigation or prosecution of criminal activity. This is a temporary visa that can be valid up to four years, and in some cases may be extended.