Well thats weird then. I assume that its pure bad luck that he arrested you for verification AND THEN saw the ''suces'' on your windshield and assumed it was for an RD and wanted you to admit of your terrible crime.
Je suis pas mal certain que tu aurais du tenir ton bout car il n'avais pas de preuve, juste un doute. Mais bon, tu a voulu être honnête et gentil et personne peut te blamer pour ca. Le policier a confisquer le RD? Ticket avec ca?
Although it sounds unusual, it's still plausible considering its an easy 650-ish$ ticket plus confiscation of an "illegal" object. Wouldn't be surprised if it was simply radio-ed out to all SQ's to be on the look out for a silver genesis coupe going to Laval with xxxxxx plate for a radar detector.
Like I said, it's the only logical answer especially since the cop came forward directly with "i know you have a detector" and his detector wasn't plugged in.
There is no other possibility if there is nothing else to the story given.
What happened isn't that hard to accomplish.
1) CBSA saw radar but not their authority.
2) Quick 1-minute phone call to contact the correct authority (SQ) and give info about car/direction going.
3) SQ just radios out the info.
4) On the lookout for Grey genesis, see it, plates match, pull over.
Not crazy considering the illegality of radar detectors and large/easy/incontestable ticket it entails.
Although there are a lot of Genesis coupes on the road, they still easily standout compared to the regular, larger number econobox traffic.