Sounds like an excellent follow-up to all the 'captured doll' threads:
http://www.freerepublic.com/focus/search?m=all;o=time;s=doll
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Yesterday, one of the news programs showed police in one city (US) were using cut-outs of cops, for example, holding radar guns. The intent was that speeders would slow down long before they recognized that the 'radar gun guy' was cardboard.
Hey, if it works.....
Dade County (Florida) police used to do this sometimes a while back. They would park a cruiser in some location with a 'fake' officer inside to trick people into slowing down. I had a friend who used to love putting empty boxes of Dunkin Donuts on top of the cars when he saw them.