Private investigator can run cameras if the police have employed them , to carry out an investigation
The law is always tricky “ we can’t but if we employ them “ they can”

We can go to get warrant and but must prove just cause ( so we.
Need evidence )

It’s like your myGov account
it’s illegal for the Some government departments to share Information
So if you need any thing from the government , unemployment etc
You have to have a myGov account
And to get one you have to link different department’s together ( they sit you in front of the computer in a myGov outlet
And you link the departments together ,
So you said yes to sharing the information)
But they not allowed to do it on there own

It’s a means to a end with out changing the law