Is It See-Through?
Cover the side of your eyes to block exterior light and if you can see through the mirror alarm bells should ring, get out of there!
Light It Up
Use the flashlight on your phone and aim it at the mirror. If you see anything shine to the other side you know you’re dealing with a two-way mirror.
The Finger Test
Perhaps the most effective trick. Hold your finger to the mirror. On a normal mirror this would appear as if you have a small gap between that of your finger, and that of the reflection. However, a two-way mirror would look as though there was one long finger.
Check out this video which reveals the finger test:
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