It can be interesting, but it is not a reliable privacy test.
A gap between your fingertip and its reflection does not guarantee that the mirror is safe.
A fingertip touching its reflection does not prove that the mirror is a two-way mirror.
And neither result tells you whether a hidden camera exists elsewhere in the room.
The test is based on the physical construction of mirrors, but viral posts often exaggerate what that observation can actually tell you.
Final Thoughts
Privacy concerns in hotels, changing rooms, rental properties, and
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