Radioactive tags were used to track dissidents

["Frederic Dawson" <ydc90@dial.pipex.com>]

New Scientist 5/01/01

Cold war, hot secret

Radioactive tags were used to track dissidents behind the Berlin Wall

http://www.newscientist.com/dailynews/news.jsp?id=ns9999289

East German dissidents probably didn't spot the plain-clothes agent with the vibrating armpit. But agents could track suspected political opponents without even seeing them. They just followed a trail of radioactivity shed by their unwitting quarry.

Fred Dawson
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