Back in the 1970’s Margaret Trudeau was the wife of Prime Minister Pierre Trudeau before the big blow-out where he gave her a black eye. She recounts in her memoirs how one Mountie assigned as her body guard knocked on the door and asked her to refrain from smoking any more pot because the odour was becoming obvious outside. Even while she was partying with the Rolling Stones before she ran off to New York with them, her Mounties did not break up the parties in Toronto despite obvious drug use.
See, believe it or not you guys down there just have far too boring politics.
Basically, there’s a simple paradigm at work. What lowly bottom of the ladder grunt is going to try to arrest his boss’s boss? Even if he managed to get anything to stick and evidence did not disappear before the trial, he’d be looking for a new line of employment. Discretion is the word. Of course, if some VIP politico pulls a stunt like lighting up in public, does not even try to hide it, then being arrested is the least of their problems.
There’s the cartoon:
Beat cop: “Did I ever tell you about the time I tried to arrest the mayor?”
Other guy: “Wow! A mere patrolman, and you tried to arrest the mayor!”
Beat Cop: “Oh, I wasn’t a patrolman back then…”