"FINGERNAIL TEST"

Not to scare you, but to make you aware. This was passed on by a policewoman who travels all over the US and gives seminars and techniques for businesswomen.

HOW TO DETECT A 2-WAY MIRROR

When we visit toilets, bathrooms, hotel rooms, changing rooms, etc., how  many of you know for sure that the seemingly ordinary mirror hanging on the wall is a real mirror, or actually a 2-way mirror (i.e.,they can see you, but you can't see them)? There have been many cases of people installing 2-way mirrors in female changing rooms. It is very difficult to positively identify the surface by just looking at it. So, how do we determine with any amount of certainty what type of mirror we are looking at?

Just conduct this 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.

-from Internet