So far this has been a very interesting thread, hopefully I can add something to it.
First, I should say I think dispatch channels should be in the clear, but only because there are ongoing costs to encryption which are never taken in consideration when the decision is made, such as proper key management. Also the majority of communication on dispatch channels are not overly sensitive. This being said, I am also a realist, aware that the day of listening in to local emergency services is approaching its end.
The first thing we should address is the misconception of the nature of policing. I get the impression some think encryption will allow for the police to get up to nefarious activities. By the very nature of the job, the fact we give to police the right to detain and arrest, they should be judged by a higher standard. I get that, but realistically do we honestly suspect by encryption, there will be a higher incidence of 'tunings' or other illegal activities? Let us step back, and exam a typical police shift in an urban environment. A platoon will comprise of how many people? How many NCO's? 30 to 40? How many of this group may be bad apples. (Yes, policing as anywhere has bad apples, no matter how they try to weed them out) But for argument sake, lets say three of the thirty. To continue, let us say one has detained an individual, who needs in their eyes an attitude adjustment. Do you think he will broadcast his intend on the dispatch channel to get his buddies over to help, where the supervisors, other members platoon, the dispatcher and any other member of the service can overhear? Do not forget, everything received at a dispatcher console will be recorded, and there is no way one can do a Rose Mary Woods. Even if he does do the broadcast, do you think the others on the above list would want to be complicit. Do you think the 20 year service Sgt. with two kids, ex-wife, mortgage, coming up to his pension, wants to throw it all away? No, PC Badapple will use his cell phone to coordinate.
Will an agency which encrypts provide media radios. Some do, some don't. The agencies with forward looking command structure will, in my opinion. Will they program, John Q. Public's radio. Probably not, never heard of an agency which would. Some concerns the system managers would have is if said radio will be compliant to the system they use. I know one can source 'surplus' radios on E-Bay and such, but since a fair percentage seem to be of dubious background, would these cause more trouble to the system? Is it a risk the agency wants to take? In life, we are try to mitigate risk, so I would assume, if they do not know the radio can directly from the manufacture, it would be a no go.
The point, of how many times police have arrested someone during the commission of a crime with a scanner, is a good point. Probably has happened, but them the flip side is, how many times has a scanner listener stopped an illegal police activity by hearing over the scanner?? I don't know the answer to either question.
I believe CPIC has two policies regarding computer systems and voice comms. Computer systems must be encrypted, but voice comms do not. I suspect there may be a working group on it, and the requirement may be written, but I am not sure if it now a requirement. The provincial police in Ontario do checks in the clear, as the area to patrol is large and coverage for the MWS is not as vast. One will hear warrants, CNI, CC and CPIC flags being broadcast, but with the current renegotiation between their service provider and the government, encryption is on the agenda.
As for it is the taxpayers money providing this service, therefore it is our right to know what they are doing. Yes, it is. This is why there is civilian oversight of police agencies. Why most provinces have independent investigators for when harm occurs to civilians. Why most police services have a public compliant process. But to morph this into an argument for listening to comms, where will it stop. Most agencies, with the advent of cheap computing power and storage, have a lot of data. One can run a street and see EVERY interaction with police over a period of years, be it reporting a found cellphone to the most heinous crimes. If I was looking to buy a dwelling on the street, should I have the right to ask for the past of my future neighbours? The data was acquired and administered on the public dime? While it might be a stretch, it holds the same argument.
As for why the reason for the quicken pace of encryption, as it seems a new agency is discussing it everyday. Streaming is not the major cause, most of the command types are not aware of it. The number one reason, was the rebroadcast by the media, of PC Stiles of York Regional Police. This has been mentioned by the Canadian Chief Association, Police Associations throughout the country. Guarantee that every vendor when making the sales pitch brings it up. Follow this with the relative inexpensive cost of the equipment, and it becomes a no brainer.
Regards to all.