I should have said in the UK and US, we have an adversary legal system. It probably sounds cynical, but at heart the legal system is not, fundamentally, about uncovering the truth but about whether (a) the prosecution's argument is solid and (b) that all due process has been followed. Some other countries have legal systems which are much less about argument and much more about discovering what actually occurred. I think these are ones rooted in the Napoleonic legal system system, but having already admitted by limitations on all matters historical, that could be quite wrong.