ED 209 from RoboCop
If the title caught your attention it is because you are a real robot geek! There seems to be a pattern when humans envision robotic law enforcement... and it almost always ends in rampage and a killing spree.
The videos below by
Jamie Martin explore this (most likely) inevitable future. The C.R.A.B. robot depicted remind us very much of the ED 209 form RoboCop.
http://www.youtube.com/watch?v=BFEC4RKXFug