I thought this was good info worthy of sharing
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 3 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 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 (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. 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. Remember: "No Space,Leave the Place"
Ladies: Share this with your girlfriends, sisters, daughters, etc.
Men: Share this with your wives, daughters, daughters-in-law, mothers, girlfriends and friends.

Not to throw mud in the water for anyone's sense of security, but In reading your post the following thougth occured to me...

Ok, I'll buy the no-gap= Two Way Mirror.
The reason for this is because normally the coating on a two way mirror is on the outside vs. the inside of the glass as with a regular mirror.
However, just because you can see a gap I would not be absolutely certain that the mirror is not a two way, as what if it is a laminated two way (if they make such a thing)or a two way mirror with another piece of glass overtop? If that were the case the mirror would pass the fingernail test, but still ba a two way mirror. Please keep in mind I've not checked to see if laminated two ways are available or for that matter if putting another peice of glass in front of a two way would have some negative effect that would make it unusable or readily detectable. But I would be hesitant to trust something like this completely.

THINKERS R SEXY!!!!

Thanks... No choice in the matter here <--- INTJ