How can you discover whether a mirror is true or if it's two-way?

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We've often heard about the 2-way mirror but could never tell what one was. 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 US 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 (they can see you, But you can't see them)? We've all heard of many cases of people installing 2-way mirrors in female changing rooms, bathrooms, etc. 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. However, if your fingernail DIRECTLY TOUCHES the image of your nail, then BEWARE, FOR IT IS a 2-WAY MIRROR! "No Space, Leave the Place" So remember, every time you see a Mirror, do the "fingernail test." It doesn't cost you anything. I don't usually post this type of discussion and I am probably not going to get any points for it but I feel that it might have some impact and serve some purpose for the women in myLot and for the men to pass on to their mothers, wives and daughters. So please forgive me if you think I am taking up space or wasting your time.