It's difficult to respond, because, as you know, that portion of the legislation has never been resorted to. We can't look to the police and ask when they needed to use it; they didn't need to use it. It's difficult.
I would tend to disagree that it would be difficult to craft the correct wording, because, you're right, we do it now, mostly through case law. But by way of an example, if evidence is going to be destroyed now, the police officers don't have to get the search warrant...or at least they run the risk of being told later they needed to. Or it's for the safety of the police officer. They can search that vehicle in certain circumstances if they believe the safety of the police officer is in danger.
So I'm not sure it's impossible to craft, but I'm also not sure it's necessary that they have that power, because they've never had to use it.