Where Do The Greys Usually place the Implant?

Yup, they exist, yet people still carry on about them being alien technologies. The only ones that could be called alien would be nanotech implants, but we'll have those in short tiem if we dont already. I'd bet that all of the reported implants, from a decade or so ago, that werent made up, were simply military. But alien/ALF/UFO-flying-ship-from-another-planet people dont want to hear about that. That's bias.

Xray would be interesting to get but of your head I guess it would have to be a catscan no?

What about deposits? We have metalics in our body that can make a deposit form that would not be earthly..maybe?