I flew into YYZ, got a green sticker, and then went on my merry way. Three days later I get an SMS that I had been selected for "random" testing. By then I was already back in the US. I replied with that info, and that was the end of the matter (I hope). It's rather ferkakte. If I was selected for testing, why didn't I get a pink sticker? The previous time, my wife was selected, given a pink sticker, and did her test right at arrivals in YTZ.