How to Detect ’Two way mirror’ and Stay Safe from Hidden Camera _ $$007

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.