Arm of the Law by Harry Harrison:
Science Fiction Inventions, Technology and Ideas

Excellent short story details the arrival of an experimental police robot in a dusty little burg on Mars. Nineport is just big enough to have a spaceport and a small police force. The whole town is in the back pocket of a local criminal mob; how will the status quo change when a by-the-book bot takes to the streets? Select an invention:

Nose Gun
Weapon system located up high.

Police Robot - a rookie cop bot
A fully autonomous, man-shaped robotic police officer.

 

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Science Fiction
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