In a case such as this they in fact do not know the vehicle is stolen. It could have simply been lent to the person driving it. Until they speak with the owner, IF they event take the opportunity to speak to the registered owner, the vehicle is not consider stolen if nobody complains about it.
Generally, in the course of a traffic stop the investigation can take many directions. On some occasions police obtain reasonable suspicion that the vehicle is stolen (or taken without consent). I was not discussing cases where vehicles were lent to someone, but that could be one of the paths you end up at. Another path is the driver is using another means to start the car other than the manufacturers keys, the driver is unable to provide correct details of the registered owner and/or under questioning roadside the occupants admit that the vehicle is stolen. Once you gain reasonable and probable grounds you can arrest, charter, warn, etc. even if the RO doesn't answer their phone right then to confirm. I once stopped a gentleman for a common traffic offence. After listening to his version of events and noting how he asserted that he personally owned the pickup and had a licence from another province but no ID on him. I arrested him and pointed out that the screw driver in the ignition was not a key and that the pickup was owned by the Province of Alberta. Something he didn't know. After some discussion, he admitted the theft. Yes a vehicle is stolen simply once it is stolen. Not once someone complains. I have also had to release a couple people roadside (after confirming ID) when I suspected the vehicle was stolen but hadn't got the RPGs through my investigation for an arrest till long after they were gone. In those cases I then laid the Information, got a PI warrant and made efforts to find them.
I call BS on that one. Yes, police may find someone they suspect breaking into a location and in such case the person is under investigative detention until the matter can be cleared up. I have also never heard of anyone pleading guilty at first appearance and then being convicted and sentenced immediately. Also, without a complainant to speak to the illegality of the act the Crown would not be able to make a case. Sure, the police may catch Bubba breaking into my house and a check of Bubba's ID shows that he lives 50 miles away but that is hardly grounds to convict even if he pleads guilty.
Call BS all you want. But you are incorrect. Again investigative detention can be used but once you get RPGs, then arrest, charter, etc. You find two 15 years old's in the local judges house and the back door smashed and you know he is away on holidays. You conduct an investigation and in this case both gentlemen were close to their first appearance date before the judge came home and saw our cards sitting on his kitchen counter with the request to call for a statement.
I don't know if your police experience was in a large metropolitan police service or some special investigative body. But in small town rural policing. I have arrested people early in the am, taken them back to the detachment, after their lawyer call and doing up an Information, Prosecutors Information Sheet and a copy of the accused criminal record taken them directly to court as a fresh arrest had them do their first appearance before the local judge, seen them plead guilty, get sentenced and taken them to cells to await transport later in the week to the correctional centre.
It's all a little different depending on where you police. I am guessing that you also haven't arrested people and had to transport them back on your snowmobile or ATV. Or prosecuted your own summary conviction offences while acting as court security also. Possibly never had to pick up the court party (Judge, clerk, Crown and Defence) from the airstrip and drive them to the community hall for trials. Or done the first appearance date in the Detachment lobby as the weather was too bad for the plane to land.
Oh, and our local media likes us. They have even sent us scene photos and other things when they thought it would be helpful. Like when I forgot the camera at the office one time.
Anyways that's enough as this has really derailed the main part of this topic. If you ever want to see another style of policing and will be in Alberta feel free to drop me a line.