

The castle doctrine simply creates a presumption that one has acted in self defense.
In general, you may apply to change your nonimmigrant status as long as you were lawfully admitted into the United States with a nonimmigrant visa, your nonimmigrant status remains valid, you have not committed any crimes that would make you ineligible, and you were not admitted to the United States in one of the following visa categories:Visa Waiver Program (VWP); Crew member (D nonimmigrant visa) in transit through the United States (C nonimmigrant visa); In transit through the United States without a visa (TWOV); Fiancé(e) of a U.S. citizen or dependent of a fiancé(e) (K nonimmigrant visa); Informant (and accompanying family) on terrorism or organized crime (S nonimmigrant visa).