Sigh.
I was waiting for this vehicle to show up here.
Just so everyone is clear I can CONFIRM the following:
CSIS Does NOT, I SAY AGAIN, CSIS DOES NOT RUN GREEN. (don't ask me how I know, no, I do not work for them, but I DO know)
Where I THINK the OP MAY be getting confused is.. Let me guess.. you saw a "VIP" or other "dark vehicle" escort with a single small green light to the rear, either flashing, or steady on, in and/or around the third brake light... am I right?
If so, thats RCMP. And its not used as a warning light, its one of their convoy lights when they are in convoy formation. Sometimes they "accidentally" get left on, even when no other warning lights are flashing.
VFF CANNOT run any other colors than green. Toss white into the mix, and you are pushing it. Do I use white? Sure, however VERY rarely will I use it. (side markers) Don't believe me? I can put you in touch with some good friends in the OPP.
The only "VFF" vehicles which can run more than green is DEPT OWNED fire apparatus.. So, if the fire dept issues a suv/car/truck to its officers/chief, they can run red/white/green as they see fit, along with sirens. Quite a number of smaller VFF depts will actually have a green light tossed onto their larger apparatus as well, just to signify the whole "VFF" status.
And before anyone calls me out on it, YES, I DO have RED- to the rear (taillight flasher)- however the ONLY time its used is when my vehicle is FIRMLY in PARK, and only if traffic conditions warrant it. (ie: Stopped at an accident on the side of a busy highway, etc) I never EVER have my vehicle in motion with red on. I also have green to the rear, and I have been to enough random accidents over the past 5 years and only asked once why.. Scene safety and the officer was fine with it. (he also made sure I had nothing red to the front)
Only people in Ontario who can legally run green is Volunteer Fire Fighters (who are signed off by their chief or dept signing authority), Halotazah on official calls, and Fleet owned vehicles of St. John Ambulance. (This is as per the Highway Traffic Act of Ontario)
Don't believe me? Look at my "occupation".