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This depends on the specific situation, can not be generalized, first of all, to see whether the cabinet is placed correctly.
Quack、、、 the atmosphere is so bad. Maybe I'm afraid of SL to the women's restroom FZ.
Whether it is illegal or not depends on its purpose. If it is not illegal in a company or institution, it is suspected of violating the privacy of others.
If you re afraid,turn off the lights and scan it with your phone camera to see if there are trees and red spots.Or do you want to pretend
School toilet security cameras I don't think it's legal. First of all, you are violating personal privacy, and the second is to interfere with the school system, the management of the school has been strongly deteriorated, or suggest that the school dismantle the camera, if it is opposed, I can only use the law to sanction the school.