I remember Stanley Benn remarking that one needed to be a certain age to engage with problems in political philosophy - I think he had in mind a certain breadth of understanding and experience - and so my political interests developed more slowly than the others.

I confess to being something of a philosophical butterfly. The world is full of so many interesting questions, and although my greatest passion is for some form of applied ethics, that leaves me with oodles of possibilities, many of which I have never had the time or opportunity to explore in great depth.

Structurally I don't see a fundamental difference between what we may reasonably expect of police and doctors - though obviously the fact that doctors are generally pursuing life-saving activities and police may be engaged in life-threatening activities may lead to differences in how we construe the moral limits to their roles.

In separating out, say, legal and moral requirements, I tend to work with paradigms rather than strict divisions - eg, paradigmatically, legal requirements are jurisdictionally bound whereas ethical requirements are aspirationally universal; ethical requirements focus especially on intentions whereas legal requirements focus primarily on conduct; ethical requirements take priority over legal requirements; and so on.

The various roles we incorporate into the criminal justice system as well as the ways in which we construe such roles, lend themselves to the kind of ethical reflection that is open to us all. That said, once we have determined roles and their contours, those who act within them may have special duties and privileges that others may lack. Specific roles may generate ethical inquiries with novel forms, just as new technologies may push us in new directions.

I remember Stanley Benn remarking that one needed to be a certain age to engage with problems in political philosophy - I think he had in mind a certain breadth of understanding and experience - and so my political interests developed more slowly than the others.

Police have both extra constraints and extra permissions - on the one hand, they can't dodge involvement in social disorder as the rest of us can and they may be required to conduct themselves privately in a way that does not undermine their public authority; on the other hand, they have permission to engage in deceptions, invasions of privacy and uses of force that are forbidden to the rest of us. But this does not put them beyond common morality.