How to test for a two-way mirror:
- The fingernail test: Place the tip of your finger against the glass. On a regular mirror, you’ll see a small gap between your finger and its reflection. If there’s no gap and your fingernail seems to touch its reflection directly, that might be a two-way mirror.
- Tap the glass: Real mirrors are often mounted against a wall and sound solid when tapped. A two-way mirror may sound hollow, as it may have space or even a room behind it.
- Use your phone flashlight: Shine a light around the edges. If you can see beyond the glass or spot a suspicious-looking void, ask hotel staff immediately.

2. Look for Hidden Cameras — Yes, Even in Hotel Rooms
While it’s illegal for hotels to install cameras in guest rooms, that hasn’t stopped some malicious individuals — sometimes even guests — from hiding covert surveillance devices.
These cameras can be cleverly disguised as:
- Smoke detectors
- Alarm clocks
- Wall chargers
- Light fixtures
- Even inside air vents or behind picture frames
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