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Learn How To Check For Two Way Mirrors And Hidden Surveillance Cameras (Video)

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(N.Morgan) In the age of high tech video cameras and surveillance devices knowing how to check for two way mirrors can be an essential skill to maintaining your privacy. 

Have you ever been in a bathroom, dressing room or another private area with a mirror and had that feeling that someone is watching you?

You can check to see if a mirror is transparent by observing how it is installed and using a few simple techniques to determine if there’s a wall behind it.

You may have heard about the fingernail test but there are more accurate ways to tell if a mirror is two-way or not.

How To Detect Hidden Camera In Trial Room?

When going to court, make sure to bring your cell phone. Upon entering the trial room, make sure you are still able to make phone calls. If you can’t make a call, there is a hidden camera somewhere nearby.

The issue is due to the interference of fiber optic cable during the signal transfer.

How To Detect A 2-Way Mirror?

When we visit bathrooms, hotel rooms, changing rooms, etc., how many of you know for sure that the seemingly innocent mirror hanging on the wall is a real mirror or is actually a 2-way mirror?

How a 2 way-mirror works is basically they can see you, but you can’t see them.

There have been several cases in the last decade of people installing 2-way mirrors in female changing rooms or bathroom or bedrooms to spy on unsuspecting people.

It is nearly impossible to positively identify the surface by just looking at it. What method can be used to determine with certainty what type of mirror we are looking at?

How to Detect ‘Two way mirror’ and Stay Safe from Hidden Camera

Here’s A Simple Test

Place the tip of your fingernail against the reflective surface and if there is a gap between your fingernail and the image of the nail, then it is a genuine mirror.

However, if your fingernail directly touches the image of your nail, then beware, it is a 2-way mirror! (There may be someone seeing you from the other side).

So remember, every time you see a mirror, do the “fingernail test.” It doesn’t cost you anything and it is simple to do and takes only a second of your time.

The reason there is a gap on a real mirror, is because the silver is on the back of the mirror under the glass.

This ensures your safety and privacy. 

Whereas with a two-way mirror, the silver is on the surface.

 Make sure and check every time you enter in hotel rooms,bathrooms, changing rooms, any place that might have mirrors to spy on your most intimate moments.



See all stories by N. Morgan

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    Total 11 comments
    • Pink Slime

      Hello Angle#3(prelim),

      Charlie here. I would NOT trust any mirror I cannot see behind. So don’t do anything in front of a mirror (you cannot see behind) that you don’t want them to see, or the “do-not” test. :lol:


      Charlie (so be safe by always thinking about the do-nots) :lol: :lol:

    • Eggzactly

      Wow! Never knew that, now I do. :eek: Thanks again N!

      • Ambicatus

        ja! of all the posters, this nice lady is the only one who posts REALLY handy stuff!

    • Mr. R. West

      I don’t believe the cell phone check. They seem to work fine around a lot of electronics!

      • Geeper

        Yeah, this makes no sense. Cellphones have video cameras in them!

        You need an RF detector or a way to scan the local wi-fi network to see what devices are connected to it. Or a glint finder app at a pinch.

    • underdog

      I have this wired ability to walk into a room and I know were all the cameras are without even looking and I dont even need to know set the room is set up .

    • 2QIK4U

      You’ve gotten the courtroom phone call wrong. :grin: you obviously saw my poster on fakebook. Thanku for not stealing it but you could of explained it properly. Your still doing a great effort since i havnt noticed ANY church/bible crap.

    • Sun Rabbit

      Definitely useful information, but I knew about this in the 5th grade back in the 60s from reading Nancy Drew and Hardy Boys books.

    • Roadrunner

      Thank you

    • GodhelpUS

      The “Hidden” Surveillance Cameras r in your smart phone

      The Future of Freedom: A Feature Interview with NSA Whistleblower William Binney

    • Jeffery Pritchett

      I do this test all the time, and if it is a two way mirror, then its show time!

      ( o Y o )

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