Somark Innovations has come up with one of the most unique and arguably coolest ways to track biological life forms, the tattoo, but not just any tattoo. Within ten seconds anyone, man or animal can be marked with a passive RFID ink tattoo, which emits a traceable signal up to a whopping distance of four feet.
The ink comes in a variety of colors, including transparent, which is good, because I have a devious idea I’d like to try out.
Just for a goof, I’d like to drug all of my closest friends while they sleep and tattoo invisible penises on all of their foreheads and then track them… okay, not track them, but I’d definitely do the penis on forehead tattoo thing. On second thought, I don’t really need special tattoo ink to do that. Awesome!
Engadget.com: RFID tattoos for tracking cows... and people