Police hacking

[Peter Fairbrother]

http://www.theregister.co.uk/2009/05/15/soca_hacking/

"In the UK, hacking by law enforcement agencies is covered by the 
Regulation of Investigatory Powers Act."

Where does it say that?

It doesn't seem to fit in part II, but I may be wrong. Is hacking 
"surveillance"?       [maybe 48(2)?]

If so, is it intrusive (and thus only a chief constable can authorise 
it)?         [maybe 6(5)?]

-- Peter Fairbrother