Sometimes it is good to check quickly to see what that person who just passed you with the odd look on his face -- or anybody else behind you -- is doing.
You could make a half turn or twist your head around of course, but that is awkward and very obvious (not necessarily bad in some cases) and there are other ways you might want to accomplish this in some cases.
One way is have a small round mirror that would fit into the palm of your hand that you can easily pull out and watch that person or the scene behind you, just as you do when driving. Many loss prevention people working in stores use such mirrors to watch suspected shoplifters at the end of a store isle. They simply hold the mirror quickly up to their eye while their back is turned toward the suspect to watch his or her activities. It work excellently.
Or if you have the money and want or need to work more professionally, you can buy a special pair of sunglasses used by professional surveillance operatives.
These have a special lens for covert surveillance of the scene behind as you walk along or pass somebody. Like everything else these come in a variety of prices and quality ranges. The best have the rear-vision strip embedded right in the lenses.
You can check the yellow pages for dealers in this type of thing or check out Eye Spy magazine for more information. They print quite few advertisements for this type of thing.
Don't buy anything compulsively, however, check such devices out carefully first -- and remember that old hand-held mirror might be all you need.
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