A flight I often like to do with new passengers is the 'Detroit Loop'. A large circle around Detroit Metro's airspace that takes me right over downtown. I've done it dozens of times, but while flying down the Detroit river I will often 'bust' Canadian airspace by a couple of hundred feet or so. Metro's airspace crowds right up against the Canadian border allowing an extremely narrow corridor at what I would consider a safe altitude. Is there a possibility that this activity will attract any unwanted attention? I'm usually on Flight Following with Metro and I'm never flying over Canadian land space (only the river), so I can't see this as being an issue. But an FAA bureaucrat with nothing better to do may think differently.