Multi generation abductions are real as far as I can deduce from my own experiences, I also think there is a great likelihood that couples are matched by hidden hands to further this.
What it is they are watching, following or using within these 'lines' is anyones guess, but I doubt it's anything we would expect, we always ascribe our behaviours to non human entities as much as we do to animals, but their desires & goals could well be something very 'alien' to us.
I haven't got any links about newer types of implants, I did have photos until one of my regular hard disc failures but I wouldn't dare post them anyway even if I still had them.
Following a very unpleasant abduction a series of tiny wire like implants came out of my spine (between the shoulders) over several weeks, they started to come out by themselves & then I used a venom pump to suck them out, then they would dissolve into the blood that came out with them in only a few seconds.