Is the present or past state of someone's mental health sufficient safeguard?. Functional mental health issues can happen in somebody's life - something like 25% - 30% of the population? So, to protect the rights of gun owners, is it then reasonable for everyone in the UK to be psychiatrically assessed several times a year, or is that a greater intrusion on individual liberties? Otherwise how would one guarantee that a gun owner will not, at any time in the next 50/60 years present a danger to themselves or others? In the case of having used a gun for any crime, how do you make sure that those who do not have police or criminal records PROVE they they have never done so, anf will never do so in the future?