I think the more interesting discussion here is the same cops want no encryption on user's phones or at least the ability to bypass it. The same reasons they cite are the same reasons users want encryption. While not surprising that they want it both ways, just frustrating.
I also wonder about FOI act consequences. They are using public spectrum and public dollars. It seems like the scanner should be unencrypted and if they need secret messaging use another channel and do it over the internet.