It may be possible to have invisibility shields. Scientists are exploring ways and means of achieving this goal.
Note: They are nowhere near having a practical device as of today.
Out of Sight: Science News Online, July 15, 2006
Amit Shirodkar's blog. This blog has 2 parts: 1) My own thoughts on a variety of subjects. 2) A collection of links, stories, articles, etc. that I found on the web, liked and wanted to share with others.