But of course, the problem is different: what KIND of policing we need, and how do we provide accountability. Quis custodiet custodes? [0]
[0]: https://en.wikipedia.org/wiki/Quis_custodiet_ipsos_custodes%...
edit: note that the "ipsos" part of the sentence in the wikipedia link is correct, but can be largely omitted. I studied Latin at school (loved it) and this happens frequently with Latin quotations.
Compare
> Who will guard the guards themselves?
with
> Who will guard the guards?