Legal Beagle by Graeme Edgeler

I think I've run into this with the Government Statistician getting legal advice from Crown Law and not being in a position to release it. I didn't understand the underlying principles then, though.

I find it interesting that the police have at least released their front-line operating guidelines, as it relates to Level four enforcement...

https://www.police.govt.nz/about-us/publication/operational-policing-guidelines-alert-level-4

Is such information normally released?