Is your mirror a two-way mirror? How can you tell when you are in a room, restroom, motel etc.with a mirror or a 2-way glass? Here's how: I thought it was quite interesting! And I know in about 30  seconds you're going do what I did and find the nearest mirror...... Do you know how to determine if a mirror is 2-way or not? This is not to scare you, but to make you aware. A policewoman who travels all over the U.S. and gives seminars and techniques for businesswomen passed this on.  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 verydifficult to positively identify the surface by just looking at it.