Arresting data

I make no bones (interesting cultural reference point, there) for returning to the important point about being careful what you measure. I recently read an American local newspaper which was lauding the local police force for its improved productivity - they had arrested more felons in the last month than in each of the previous 6 months.

Now, all well and good ... but it depends on what you want from a police force. I would prefer fewer arrests, with more prevention and deterrence.

But 'safe streets' look like an idle police force .. nothing to shout about or to be rewarded for.