One of the male teachers in my high school was caught placing a videocamera in the vent of the girls’ locker room, a couple years after I left.
He was a moron and got caught because of the red ‘recording’ light being spotted in the vent (first minute of the video was apparently him fiddling with the camera then walking away), but I think there are certainly others capable of getting away with such an awful intrusion.
I hate the locker room in my school. I was never sexually victimized, but I had a lot of acne, and there were plenty of garden variety douchebags who made sport of pointing it out and acting disgusted. And there was definitely a lot of homophobic crap happening, though I really hope that things have improved since the 80s.