How about a Security Robot with Taser, Security can maintain a safe location to control the robot and in effect still protect the premises... Of course would be equipped with normal camera, sound, voice with a body possibly arms? the body would need design to avoid tipping over easy either by terrain but also any would be intruder.
I feel it would allow security officer to avoid the dangerous first encounter, that is mystery as to if intruder is aggressive or extremely dangerous .
There are times when the security camera's are not enough!
Other robots from Synthiam community

Ezang's My New Robot Arm On ARC
My new robot arm on Ez- builder - video next week coming - he has a gripping personality

Vgosine's Robotic Arm
Hi Everyone This is a robotic arm that i put together, simply using ez-bits. It is primarily designed to feed someone...

Bhouston's Inmoov's Touch Sensors
The other day DJ suggested an easy way to make a touch sensor, see this thread...