I bought a cheap camera three years ago. It's wireless and has a battery. Everything after that is just a matter of using a UPS and hiding the computer or DVR somewhere. I use a computer, and can set some free software I found to upload images and alert me when ever it detects something. Newer cameras are better, and have all that stuff built in. There's no "line" to cut anymore.

beyond a shadow of a doubt

And you're telling me someone out there is firing a 500kW laser into space