This discovery brought a bit of surprise to Lu Chuan.
Installing hidden cameras in hotels is something that's frequently reported in recent years.
Some people even make a living by selling secretly recorded footage from hotels.
Some illegal overseas websites have dedicated channels for collection.
Where there's hidden filming, there's counter-surveillance.
There are many methods and devices or apps online for detecting hidden cameras in hotels.
When Lu Chuan was in college, he studied cases related to this.
Hidden cameras in hotels are generally installed in bedrooms and bathrooms.
The installation positions are often very concealed, such as smoke detectors, power strips by the bed, decorative paintings, wall lamps, fire sprinkler heads, and phones.
The most common detection method is to turn off all the lights in the room and scan the entire room with a mobile phone flashlight.
