Spy cameras have been used for quite a long time, but only recently have they become really capable of pulling off some incredible stuff. Most people look at spying at something that can only be done if it is nearly impossible for others to spot the camera.
Just a few years ago, the cameras were simply too big to really have a legitimate way to spy. It would have to be put in a unique area that was covered quite a bit. Cameras are so small now that spy cameras can be put pretty much anywhere these days. In fact, some people even go as far as wearing spy gear right in the open.
Affordability has really made all of this possible. A small camera now only costs a little bit of money, making more and more people interested in getting one themselves.
