It's a tough issue IMO.

The term is so broad that it could almost theoretically allow anything to be admitted - illegal wire taps, illegal searches etc etc.

And if the police submit evidence that they've illegally entered the suspects house, are they not admitting to a crime?

Then is that in turn OK as long as they found something (massive incentive to find something - anything - to ensure the department isn't sued), or are the police immune can go into anyone's palce or car whenever they feel like it as long as they say they're looking for something).

In cases where all but one form was signed in duplicate not triplicate and due to this the druglord gets away with the 300kg of coke I'm happy with this. It's the other areas that are far more grey. Very transparent oversight is needed - else police powers are almost without limit.