I don't know.

Here in the civilised first world, people aren't allowed to carry guns. We have far less gun crime. Our police, who don't carry guns normally have armed response units who do. Each and every time a shot is made, there is a full investigation.

Still, they do cock up just like your police do. This makes our reaction to the idea of members of the public carrying guns being something that should never happen and never can in civilised countries.

The Foreign Office advice for UK travellers to The USA warns us of the problem.