Judge Richard Leon yesterday ruled that the licensing screening is likely unconstitutional, a victory for gun rights advocates who favour loosening gun laws in the name of self-defence.
Washington has traditionally had one of the most stringent laws in the country regarding concealed carry permits, requiring individuals to justify the need to carry a gun in public.
Gun lobbies have pushed for years to strike that clause from legislation.
In his 46-page ruling, Judge Leon wrote that the clause likely violates the Second Amendment of the US constitution, because "the right to bear arms includes the right to carry firearms for self-defence both in and outside the home."
Under the capital's rules, individuals granted the right to carry concealed arms must stow them under clothing in a bag, or in the glove compartment of a vehicle.