With a cursory glance into crime, investigation, and/or security/privacy, I see it's exceedingly easy to find a picture of a security camera. Come to think of it, the whole topic is covered from wildly abstract to completely cliche. The fun for me has been picking out a handful of images that excite. Ones that raise and eyebrow. Check them out. Add your own in the comments, and designers... do these fine contributors the honor of a download. You'll make their day.
Thanks so much.