6/22/25: Once, while living with our family in a New Brunswick apartment in the late 1980s, I would occasionally see a pale young teenaged girl appear for moment or two on a balcony, but there was never any sign of her going to and from school or outside at all.
I spent a good portion of my career on this subject, way back around 2000. Much more here: https://www.epi.org/publication/sfc/
Thanks Max, put in my bib, and commented on it.