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Re:I Opted Out of Facial Recognition at the Airport – It Was... by vinceguidry on Wednesday July 03, 2019 @12:13PM (#20345663)
His experience was in the UK.
Re:I Opted Out of Facial Recognition at the Airport – It Was... by sokoloff on Wednesday July 03, 2019 @12:28PM (#20345847)
I was able to opt out in Dublin at the secondary security point (where one clears immigration in Dublin for US-bound flights, so I think that particular scanner was operated at the direction of the US authorities).

I have not tried to opt out of a pure-EU/UK scanner, so your point is still valid. I suspect Toronto may work the same way.