I've been following Applied Digital and it's subsidiaries for several years now.
The farthest distance I've seen claimed is 10 feet, and that was in conjunction with the tracking of salmon implanted with the microchip.
They also have walk through devices for livestock with a range of 12" - 18".
The PLD (personal location device), which is the size of a pacemaker, is still in the development stage. It does not have FDA approval, nor has it been applied for.
"The PLD (personal location device), which is the size of a pacemaker, is still in the development stage. It does not have FDA approval, nor has it been applied for."
Yeah. I read about their prototype. It's actually battery powered and not purely passive.
It appears that they are talking about shrinking the prototype to half the size of a pacemaker.
Still needs to have the battery recharged via induction.
Even at that size it would need minor surgery to implant.
Not exactly something Big Brother is gonna sneak up with in the middle of the night and inject under your skin.