In the US, being blind is no bar to owning and carrying firearms. The blind people who do it say they are simply exercising their constitutional right, and present no danger to the public.
When Carey McWilliams went to the sheriff's office in Fargo, North Dakota, to fill out the paperwork for a permit to carry a concealed weapon, the staff immediately noticed he was holding the harness to a guide dog.
The woman behind the desk pointed out that he would have to pass a shooting test before being granted the licence, but McWilliams said he knew that. He told her not to worry.
"So then she took a picture of me, and my application then went up through the ranks - it got the signature of the chief of police of Fargo, the sheriff and the state attorney general's office - and they kept calling me and calling me, saying: 'There's a shooting test, there's a shooting test.'"
The day of the test came, and McWilliams duly went along to the police firing range with a friend who was also trying for a permit. The targets were half-size cut-outs of assailants, positioned seven yards (6.4m) away. McWilliams fired a series of shots with a .357 magnum, all of which landed in the heart region of his target.