Thanks for your thoughtful comments all four of you. IMHO the custodians of our peace and security are less likely to behave badly if they know for a definite fact that they are being watched and could very well be called apon to give account of any such incidents of unprovoked attack of armed security officers by unarmed persons. Do you think it would help to prevent or reduce this kind of thing if incident prone areas such as the reception area of the ER were under 24/7 video surveillance and mandatory reporting of all such incidents was required, with any misbehaviour that occurs outside of the monitored zone being regarded as especially suspect? My bias is in favour of public scrutiny of those with a licence to use force. Do other countries have this problem? If so how do ther manage it?