Most derringers have no hammer block safety. The NAA does have safety notches, but one has to be smart enough to use them.

While I obey all laws I have to admit that being legally dead is not a good option. It is only a matter of time before a terrorist picks a hospital. Hospitals should have ARMED security, but I have never seen an armed hospital guard, except for campus hospitals(university police) but then they rarely patrol the hospitals. I did see one in Wake Med 4 years ago when I went in for a pacemaker though. Our local hospital has elderly unarmed security guards.