Any Proof That Spot Monitors Deter / Stop Crime?

Any one got any stats on the effectivenss of spot monitors as a crime deterrant. Excellent image quality customer facing monitors are putting off opportunistic crims.

As a CCTV sales man "It is the number 1 crime deterrant" is working really well but was wondering if anyone had a link to a report published that would back this up. Handy to have, and would give me extra confidence!

Cheers, g

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